You don't have to fill any form. The officer will be filling your COPR, and will be asking you some questions i.e. your address in canada, how much funds you have brought for your settlement, if you are in good health...etc. You can give your friend's address and exit canada whenever you wish, people do it all the time.People can give an address of a friend or a relative, if not they can call cic in a few weeks after they have settled and provide their address, in case they are moving back within a short period there are guest houses that can pick up your card and forward it to your address abroad for a fee.