Go to http://accounts.mmosite.com/user/mygames.php
Click on the "Add a new game" button located near the top left.
Follow the rest of the instructions on screen to add your new game, whether you've played it before, are currently playing it, orintend to play it.
Fill in the info with your user id, IGN, server etc. after selecting the game from the drop list.
After confirming, you're good to go. To add another game, just repeat same steps.