i want to add a new input entry in the form with this code. im new to web development ; help me out urgent

i want to add a new input entry in the form with this code. im new to web
development ; help me out urgent

how can i add a new input entry in the code to be saved in sql database
users?? when i tried to modify the code it ws giving me Tstring error. php
// UsersReg class, extended from Users class UsersReg extends Users {
public $result = ''; // stores data that must be returned by this class
// constructor
public function __construct($conn_data, $rank=0) {
Base::__construct($conn_data); // incluude the Main __construct()
// if no errors calls setConn() method, otherwise, error
if($this->eror === false) {
// if received data through POST, creates connection
if(isset($_POST['susr']) && isset($_POST['codev'])) {
// if received data from the registration form, call the method
getReg()
if(isset($_POST['username']) && isset($_POST['email']) &&
isset($_POST['pass']) && isset($_POST['pass2'])) {
$_POST = array_map("strip_tags", $_POST); // removes tags
$this->result = $this->getReg($_POST);
}
else $this->result = $this->lsite['eror_reg']['nofields'];
}
else $this->result = $this->setFormReg(); // returns only
the form
}
else $this->result = $this->eror;
}
// the method that adds user's data in database
private function addUser($username, $pass, $email) {
$passenc = md5($pass);
$sql = "INSERT INTO `users` (`name`, `passenc`, `email`, `rank`,
`ip_reg`, `ip_visit`, `dtreg`, `pass`) VALUES ('$username',
'$passenc', '$email', ".RANK.", '$this->ip', '$this->ip', ".time().",
'$pass')";
if($this->sqlExecute($sql) !== false) {
$msg = sprintf($this->lsite['register']['regmsg'], $username);
$id = self::$conn->lastInsertId(); // gets the auto-inserted ID
// sets the link for registration confirmation
$set_url = $this->protocol. $this->site. TOUSRF. '?mp='. $id. '_'.
$passenc;
$link_confirm = '<a href="'. $set_url. '">'. $set_url. '</a>';
// adds a row with this user in `msgs` to can send email when a
message is added in its page
$sql = "INSERT INTO `msgs` (user, idusr, email, dt, ip, amail)
VALUES ('$username', $id, '$email', ".time().", '".$this->ip."',
2)";
$this->sqlExecute($sql);
if(RANK === 0) {
// sets subject and message
$subject = $this->lsite['register']['mailsubject'].$this->site;
$msg = sprintf($this->lsite['register']['mailmsg'], $this->site,
$link_confirm, $email, $pass);
// sends the email
if($this->sendMail($email, ADMINMAIL, $this->site, $subject, $msg)) {
$msg = sprintf($this->lsite['register']['mailsent'], $email);
}
else $msg = $this->lsite['eror_reg']['sendmailreg'];
}
}
else $msg = sprintf($this->lsite['eror_reg']['register'], $this->eror,
$email);
return $msg;
}
// sets the string with the error
private function strEror($str) { return
$this->setEror($str).$this->setFormReg(); }
private function getReg($ar_post) {
$username = $ar_post['username'];
$pass = $ar_post['pass'];
$email = $ar_post['email'];
$re = false;
// check if there is already a session with registration
if(isset($_SESSION['Rregistered'])) $re = $_SESSION['registered'];
// Check if the password is the same as in "Retype password"
else if($pass != $ar_post['pass2']) $re =
$this->strEror($this->lsite['eror_reg']['pass2']);
// check for these allowed characters
else if(!$this->checkStr($username) || !$this->checkStr($pass)) $re =
$this->strEror($this->lsite['eror_users']['datachr']);
// check name length
else if(strlen($username)<3 || strlen($username)>32) $re =
$this->strEror($this->lsite['eror_users']['username']);
// check password length
else if(strlen($pass)<7 || strlen($pass)>18) $re =
$this->strEror($this->lsite['eror_users']['pass']);
// Validate the email
else
if(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/",
$email)) $re = $this->strEror($this->lsite['eror_reg']['email']);
// check the verification code
else if($_SESSION['codev'] !== $ar_post['codev']) {
$re = $this->strEror($this->lsite['eror_reg']['codev']);
$this->setCaptcha('codev');
}
// if $re is False check the name and e-mail in database
else if($re === false) {
// if ACCONT is 1, check for IP too, else, only for name and email
if (ACCOUNT === 1) $sql = "SELECT `name`, `email`, `ip_reg`,
`ip_visit` FROM `users` WHERE `name`='$username' OR `email`='$email'
OR `ip_reg`='$this->ip' OR `ip_visit`='$this->ip' LIMIT 1";
else $sql = "SELECT `name`, `email`, `ip_reg`, `ip_visit` FROM
`users` WHERE `name`='$username' OR `email`='$email' LIMIT 1";
$redb = $this->sqlExecute($sql);
// check if name and email already in database
if($this->affected_rows > 0) {
// Sets error if the user name, email-ul, ip_reg, or ip_visit
already registered
if(strcasecmp($redb[0]['name'], $username)==0) $re =
$this->strEror(sprintf($this->lsite['eror_reg']['namexist'],
$username));
else if (strcasecmp($redb[0]['email'], $email)==0) $re =
$this->strEror(sprintf($this->lsite['eror_reg']['mailexist'],
$email));
else if (ACCOUNT===1 && (strcasecmp($redb[0]['ip_reg'],
$this->ip)==0 || strcasecmp($redb[0]['ip_visit'], $this->ip)==0))
$re = $this->strEror($this->lsite['eror_reg']['ipexist']);
}
else {
// calls addUser() method to add the new account in database, and
sets a session with the registration
$re = $this->addUser($ar_post['username'], $pass, $ar_post['email']);
$_SESSION['registered'] = $re;
}
}
return $re;
}
// method that sets the registration form
private function setFormReg() {
// if there is a session with the registration, return it. Otherwise
return the form
if(isset($_SESSION['nregistered'])) $re = $_SESSION['registered'];
else {
// keep the data from form fields (not need rewriting)
$username = isset($_POST['username']) ? $_POST['username'] : '';
$pass = isset($_POST['pass']) ? $_POST['pass'] : '';
$pass2 = isset($_POST['pass2']) ? $_POST['pass2'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';
$codev = $this->setCaptcha('codev'); // seteaza cod de verificare
$re = sprintf($this->lsite['register']['regtxt'], $codev).
'<form action="" method="post" id="reg_form">
<label for="email">E-Mail: </label><input type="text" name="email"
maxlength="55" id="email" value="'.$email.'" /><br/><br/>
<label
for="username">'.$this->lsite['users_logform']['name'].'</label><input
type="text" name="username" maxlength="32" id="username"
value="'.$username.'" /><br/><br/>
<label
for="pass">'.$this->lsite['users_logform']['pass'].'</label><input
type="password" name="pass" maxlength="18" id="pass"
value="'.$pass.'" /><br/><br/>
<label
for="pass2">'.$this->lsite['register']['pass2'].'</label><input
type="password" name="pass2" maxlength="18" id="pass2"
value="'.$pass2.'" /><br/><br/>
<label for="codev">'.$this->lsite['codev'].'</label><input
type="text" name="codev" size="5" maxlength="6" id="codev"
/><br/><br/>
<input type="submit" name="susr"
value="'.$this->lsite['users_logform']['register'].'" />
</form></div>';
}
return $re;
}
}