I was given a plastic, inverted bowl/hat-like collection helper that goes on top of the toilet seat. You poop into it, and then transfer into the vials with the provided aid. My kit looked like this (hat, vial, and transfer):
www.fiddledeedee.net/wp-content/uploads/2011/08/Specimen.jpgAsk your doctor for it all, if they forgot to give you all of the needed pieces.