Roblox is full of things to do and, as a result, there are tons of places/games to look through. Occasionally you may find some that you enjoy more than others and may wish to favorite them to be easily found later.
To favorite a place, start out by viewing its details page. There, simply click the star icon under the Play button. The star should change from an outline to filled-in indicating that it is now a favorite! To unfavorite it, simply click the star once more.
For more information on account and avatar customization, please see the following links: