Hi silvercoyote, welcome to the forums. Your first stop should be
here, which gives you an overview on how to edit the cart. Another good thread is
here, which answers many questions that are asked over and over again.
Finally, be sure to search the forum first before posting, as questions like these have been asked hundreds of times and can easily be found with a quick search. If you aren't finding a solution in any of those areas, then go ahead and create a new post and we'll help you out. Good luck!