If you need any help what so ever just check out How To Add Your Tracks. It should clear up a few things. You should be able to easily add your tracks in the appropriate category after reviewing that.

Free Rider Tracks by Type	Includes street, trail, gap, freestyle, autos, and many other types of tracks.
Free Rider Tracks by Level of Difficulty	Find tracks appropriate for your skill level here, including beginner, intermediate, moderate, or expert levels.
Free Rider Tracks by Author	Create your own page and store your authored collection of tracks here.