Combing User table with another Form table
I have setup a login system on my site, in which the logged in user (user table) would be able to fill out an insurance form that's saved in the database in a separate table - form_one table.

user table

username - varchar(30), Null: No, Default: None - Primary Key
password - varchar(32), Null: Yes, Default: NULL
userid - varchar(32), Null: Yes, Default: NULL
userlevel - tinyint(1), UNSIGNED, Null: No, Default: None
email - varchar(50), Null: Yes, Default: NULL
timestamp - int(11), UNSIGNED, Default: No, Default: None
valid - tinyint(1), UNSIGNED, Null: No, Default: 0
name - varchar(50), Null: Yes, Default: Null

form_one table

formid - varchar(32), Null: No, Default: None - Primary Key
username - varchar(30), Null: No, Default: None - Foreign Key
email - varchar(50), Null: Yes, Default: NULL
phone - varchar(12), Null: No, Default: None
address - varchar(50), Null: No, Default: None
timestamp - int(11), UNSIGNED, Null: No, Default: None
name - varchar(50), Null: Yes, Default: NULL
quotationinsurance - enum('insurance', 'quotation'), Null: No, Default: None
etc...

Below is my php function for UPDATE & SELECT

    function updateUserForm($username, $field, $value){
    /*$q = "UPDATE ".TBL_FORM_ONE." SET ".$field." = '$value' WHERE username = '$username'";*/ - Original code
    $q = "UPDATE ".TBL_USERS.", ".TBL_FORM_ONE." SET ".$field." = '$value' WHERE username = '$username'";
    return mysql_query($q, $this->connection);
    }

    function getUserForm($username){
    /*$q = "SELECT * FROM ".TBL_FORM_ONE." WHERE username = '$username'";*/ - Original code
    $q = "SELECT * FROM 'TBL_USERS', 'TBL_FORM_ONE' WHERE 'username' = '$username' AND TBL_USERS.username = 'TBL_FORM_ONE.username'";
    $result = mysql_query($q, $this->connection);
    /* Error occurred, return given name by default */
    if(!$result || (mysql_numrows($result) < 1)){
    return NULL;
    }

How can I join these two tables where the username in both tables are tied together. In other words, once a user is logged in, they can fill out the form and the data from that from would be tied to each unique user.

Any help would be appreciated! :-) 
Combing User table with another Form table
===

I have setup a login system on my site, in which the logged in user (user table) would be able to fill out an insurance form that's saved in the database in a separate table - form_one table.

user table

username - varchar(30), Null: No, Default: None - Primary Key
password - varchar(32), Null: Yes, Default: NULL
userid - varchar(32), Null: Yes, Default: NULL
userlevel - tinyint(1), UNSIGNED, Null: No, Default: None
email - varchar(50), Null: Yes, Default: NULL
timestamp - int(11), UNSIGNED, Default: No, Default: None
valid - tinyint(1), UNSIGNED, Null: No, Default: 0
name - varchar(50), Null: Yes, Default: Null

form_one table

formid - varchar(32), Null: No, Default: None - Primary Key
username - varchar(30), Null: No, Default: None - Foreign Key
email - varchar(50), Null: Yes, Default: NULL
phone - varchar(12), Null: No, Default: None
address - varchar(50), Null: No, Default: None
timestamp - int(11), UNSIGNED, Null: No, Default: None
name - varchar(50), Null: Yes, Default: NULL
quotationinsurance - enum('insurance', 'quotation'), Null: No, Default: None
etc...

Below is my php function for UPDATE & SELECT

    function updateUserForm($username, $field, $value){
    /*$q = "UPDATE ".TBL_FORM_ONE." SET ".$field." = '$value' WHERE username = '$username'";*/ - Original code
    $q = "UPDATE ".TBL_USERS.", ".TBL_FORM_ONE." SET ".$field." = '$value' WHERE username = '$username'";
    return mysql_query($q, $this->connection);
    }

    function getUserForm($username){
    /*$q = "SELECT * FROM ".TBL_FORM_ONE." WHERE username = '$username'";*/ - Original code
    $q = "SELECT * FROM 'TBL_USERS', 'TBL_FORM_ONE' WHERE 'username' = '$username' AND TBL_USERS.username = 'TBL_FORM_ONE.username'";
    $result = mysql_query($q, $this->connection);
    /* Error occurred, return given name by default */
    if(!$result || (mysql_numrows($result) < 1)){
    return NULL;
    }

How can I join these two tables where the username in both tables are tied together. In other words, once a user is logged in, they can fill out the form and the data from that from would be tied to each unique user.

Any help would be appreciated! :-) 