How can I add the link:

http://forum.myforum.com/index.php?action=userinfo&user=1

as MyStats in the header menu. I know how to add the html code in the template/main_header but how do I get the user=1 to change with whatever the users id is signed in? So if user 78 signs in the link <a href="http://forum.myforum.com/index.php?action=userinfo&user=78">MyStats</a> will appear in the header menu. I hope I was clear enough.

Try using {$user_id} in your template, for example:

<a href="http://forum.myforum.com/index.php?action=userinfo&user={$user_id}">MyStats</a>

Works great, thanks man, I didn't know the variable $user_id was declared yet. If your not logged in and click it, it says User does not exist!!! because the user_id == 0 which is find.

Paste this in bb_plugins.php:

Then paste in templates/main_header.html:

{$myStatsLnk}

;-)

That works better :)