I will spare you the details of how I managed. However I did discover that it was a very quick and efficient way to empty your bowels and get this upon standing up the anus quickly shuts and there is little if any residue left to wipe off
Ni hao! Wo shi zongwen sho hua sho da bu hao! No diacritics and I suspect incorrect spelling, grammar, etc...but hopefully you will get the jist. :) It's been a few years since classes.
Dr. Oz discussed this on a recent show, and he recommends that Americans put their feet up on a stool while using the bathroom to more closely mimick this position.