A "pose" is the position the judge in a show will put them in to correctly judge their conformation.
Different breeds and different types of rabbits have a different ideal "show pose." I'm not familiar with Americans, though, so I googled it and got these two pictures:
American breeders here will be able to tell you if I'm right or not, but I think those rabbits are correctly posed.
Put your doe on a flat surface that isn't slippery and try to make her look like that, then snap a photo and post it here!
The Wikipedia article on the breed describes the body shape:
http://en.wikipedia.org/wiki/American_rabbit
Buying the ARBA's Standard of Perfection book would be a good investment, it's only $20 on the ARBA website and it is WELL worth every single cent!!!
It has the point breakdown for each feature of each breed. I strongly recommend it!!!