Your favourites list is just that, a list of house sitters you like, but aren't sure about yet. This isn't your final list. If you want to select a house sitter from your favourites for your house sitting assignment, just click the 'Send a new message' link on the favourites page and send them a message saying that you are adding them to your list of applicants. Note that they may already be on your 'Current house sitter & applicants' list. It should say 'current applicant' if that's the case.