I have never tryed it but these instructional videos will explain everything.
http://www.youtube.com/watch?v=tyyjV5-QJb4
http://www.youtube.com/watch?v=xIe6z4QvIdg
This one says you can insert it in vagina or ass. I would think that inner ring would be a chore to remove from your ass. I would be willing to try it if TP is ready! lol
http://www.youtube.com/watch?v=oHx-t6wAUyc
CG