need help, user profiling

[chkdsk]

Hello all, Im a newbie, I started a project a long time ago, for my website to have a members area, I downloaded the main auth script, and i made my own profile page were people can update thier selections of guns ( Its a game website ) by selecting checkboxes and submitting it. but im stuck the bit of php i was using is not going to work for what i want now :/

I dont have real content on it yet so i can display the 'member section' to you all.

http://www.dumbppl.com/~chkdsk/tm/auth/members/index3.php?go=profile

http://www.dumbppl.com/~chkdsk/pro.phps

Is the source for the profile thingie

Now when a user clicks submit it supposed to write the users username.txt to a file to be included on a different page

This is what i was using to write the file, not only did it stop working, its not going to work if i want it to be specific to each username (which the auth script will take care of)
I need to do this w/o mysql cause i dont have a server

Here is the code at the bottom handling the file

<? 
if ($write_file == "yes") { 
$text = ""; 
for ($i = 0; $i < 66; $i++) 
if (!Empty($_POST["g$i"])) 
$text .= $_POST["g$i"]; 
$filename="profiles.txt"; 
$file = fopen($filename, "w"); 
fputs($file, $text); 
fclose($file); 
} 
?> 

If this is too much or to lame im sorry but please help if you can
Thanks alot php people

[hand]

<? 
if ($Submit) {
   $text = ""; 
   for ($i = 0; $i < 66; $i++) {
      if (!Empty($_POST["g$i"])) {
         $text .= $_POST["g$i"]."\n"; 
      }
   }
   $filename="profiles.txt"; 
   $file = fopen($filename, "w"); 
   fputs($file, $text); 
   fclose($file); 
} 
?>