How to save custom fields?

[ctimes]

I am trying to add some additional fields for users profiles for gaming handles and things like steam, vimeo etc.

I have this code setup in the modifyprofile template and have added a custom profile field (field15) to be assigned to it. I can see the field under the details page but it doesn't seem to save.

legend>Gaming Handles</legend>
				<table cellpadding="0" cellspacing="$stylevar[formspacer]" border="0" width="100%">
				<tr>
					<td colspan="2">You may enter your online gaming handles here.</td>
				</tr>
				<tr>
					<br />
														<tr>
					<td>Xbox LIVE<br />
						<img src="$stylevar[imgdir_misc]/xbox.jpg" alt="" />
						<input type="text" class="bginput" name="field15" value="$bbuserinfo[field15]" size="25" maxlength="50" dir="ltr" /></td>

Is there someone else I should be doing? I've not done this before but I found a few hacks that do a similar thing and have been trying to use the code manually to get this going as none of them seem to have all the option I want like xbox live, psn, steam, xfire, vimeo, youtube etc.

Any help would be greatly appreciated and I will be adding my final result once done for others to use if they want in the future