@Diane114....Now I can't tell you what the procedure is if you do not already have a visible listing, or a listing in the preview stage, but, you can alter anything relating to your EXISTING listing (other than payment details) if you go to 'Manage Listings', 'Calendar and more' and on the left of the screen will be your listing editing options. This is a longer method of getting to this option....but it is reliable!
Sometimes you will see an 'Edit Listing' tab as soon as you log on...but I would not give that as reliable information!
If I were you I would post your listing as is (pets and all) and edit it once it has been posted....A bit like going from New York to London via Rio de Janeiro....but, it works
Cheers.....Rob