Ok heres the story. You make a button 40x40 (including a 1px black border) advertising your LJ. You post it here in this community! Peple can then take your button and pop it on their button wall (either in their info or embedded in their layout). It will also get popped up on the website, the public button wall. Here is where the majority of buttons created will be on show and free for you to take! Simple enough huh?