You can add another user to your friends list by clicking the (Add Friend) button on their profile.
There is no way to search for other users on this version of Armor Games. There is an search engine for the Armor Games v3 beta. If you are not part of the beta, you will need to know their full username or contact them again.
1.) If you know their exact username, you can go directly to their profile using
http://armorgames.com/user/USERNAMEHERE
Type in their exact username where it says USERNAMEHERE. For example,
http://armorgames.com/user/Gantic
will go to my profile.
2.) If you do not know their username, you will need to try to contact the user.
a. If you met them on a multiplayer game you can try to find them again in that same game. If you cannot find them, try to look through the game's comments to see if they may have made a comment. If they have made a comment, you can click on their username to go directly to their profile.
b. If you know them in real life or from somewhere else, you can try to get them to tell you their exact username. You can also have them post on your thread in this forum. if they post on the forum, you can click on their username to get to their profile.
Hopefully this hasn't been too inconvenient and has helped you in getting to a friend's profile to add them, so you don't forget who they are!