The way this is set up is that it follows basically what it is like on Twitter. You can choose to do separate posts for each character or do all of them at the same time. If you do individual posts, be sure to have the character name at the beginning of each post. There is no set posting order. If you're on and you want to post something, then just do it. This is supposed to imitate Twitter as best as possible. This should eliminate the need to sign in and out of profiles, but have it set up in a way that you don't have to wait on a certain order for posting.