Sorry to say so, but this has been brought up about a million times! A user search is a common topic....and since we have all been waiting a while for it, there are some other ways to find your friends....
Way 1:
If you know the exact username...or think you know, go to your profile and click up the top in the address bar.
So you should see:
http://armorgames.com/user/'your username'
If you delete your username, and type in what you think the other persons name is then press enter, you should go to their page.
This will only work if you get their username right.
Way 2:
There is an old Community search that was removed from the normal search bar.