Can't you start the game?
Games will start automatically in any web browser that supports Flash Player, in some games Shockwave Player. Both of these modules you can download and install here: Flash, Shockwave. Anyway it might happen that you will not run the game, although you have two modules installed. In this case, make sure that you have installed on your computer the latest version of modules.
Can I create a custom category for my favorite games and videos?
Each registered user has the option after logging in to add or remove games from the "Popular Games". Reference to the add / remove is located on the page with game details description.