New question, that might explain a lot to me

I have ordered and have received a Eupho and have not had the chance to try it yet. But I am more concerned about something else. I saw in here a fella (don't remember his name) who shot a video of his aneros use. There it looked like he was pushing and contracting alternately with his anal muscles to make the MGX go in and out. Am I suppose to be pushing as well as pulling (clentching) at the aneros. I have had some success, mild to say the least, with just clentching, but if I am to push and pull that would make a lot of sense in the the aneros would move more. Someone give me some advice here? Please.