User Adding problem (code)

[Isaiah33]

I have this code which people asking to join to the forum.
i made Accept\Reject but when i click on Accept i did

		$joindate=time();
		$DB_site->query("INSERT INTO user (userid,usergroupid,username,password,email,joindate,salt) VALUES (NULL,'2','".$user."','".$pass."','".$email."',$joindate,'$salt')");
  		$userid=$DB_site->insert_id();
  		$DB_site->query("INSERT INTO userfield (userid) VALUES ($userid)");

and the user is added FINE, the problem is, he stays as a guest

Any helpers about this subject?