To join someone a pack is usually as simple as PMing the person who's in charge of that pack. To find that out go to the Topic entitled Pack Information. Your wolf doesn't need a territory or need to be part of any pack to RP where they wish, just know that the pack on that land can choose whether or not to respond to your post and in most cases if you wish them to respond it's best to post in the topic they are already RPing in so they know you're interested in joining. Plus adding a little OOC ( hey can I join?) before you post never hurts either. I hope this has answered all of your questions, I'm Kih by the way one of the Moderators here and I am willing to answer your questions should you have any more. Have a nice day.