When you first get a pet, you get the Pet Introduction Tip which says to type 'i' to open the Pet Roster. If you don't type 'I', Boochbeard says to look it up in the Tip Replay (or words to that effect). Apparently, if you are already in the Pet Roster, 'I' still needs to be pressed to continue on with the tip. I don't think that you should have to press 'I' if you are already in the Pet Roster. This may be true for some of the other tips dealing with opening screens.