I do not know my own friend code How do i find out, and do we both have to regist eachother to be friendS? Can some1 please explain?

Fox, it seems you are lost on many occasions, and I would be more than happy to help you.

Brawl friendcodes are located when you first log on the Wifi Brawl for the first time, after that you must go to Brawl with friends, then go in the Friend Roster, and you will see your friendcode on the top middle of the screen.