Go to VAPS.
Click on Sign in.
-Enter email as username
-Password should be the same as the one you use to login to the KLOV forums.
Click Games Owned / For Sale / Wanted http://www.arcade-museum.com/members/entry/my-games.php
Enter in the game you want to add. Make sure to check the option "have" or "want" depending on what your doing.
Hope this helps.
Also on this, I found I could only add them in IE as my version of firefox does not bring up the drop down list of games to pick from when typing in the names.