When you get done you should have these three only . . .

The biped, quadraped, and centaur in that particular order. The bird is not in the code you downloaded, I have not officially released the code for it yet.

Any other extra shelves are superfluous, extra, unneeded. Drag-drop to trash can on right upper side.

With the quadraped, you have to set the forward speed to make it move, to get good results, generally, I set the speed to 1, if you think it should be faster or slower, all you have to do is manipulate the setting. I have it set without speed so you can view it in different gaits easily.