Yup..wet them and smoosh them to the glass...they should stick after that..and then make sure you tug on it a little to make sure it has stuck so that the hammock isn't coming down while your beardie's trying to go up and take a nap. :wink:
Jessica, they do tend to loosen up after a few days too, so every other day, I push the center of the cups to make sure they are still secure and sometimes I hear a pop that means they were about ready to come loose, so you might want to keep that in mind.