I've also run into people there who have like 4 accounts same info, same picture. (blog.seekingarrangement.com)
First you have to pick a server from a huge list set up in different regions of the world, then you have to pick a lobby in that server, then you have to tell your friends the exact same info for them to join, then you set up a personal ring match (which by the way just recently started to work correctly), and then wait for all your friends to hopefully join the lobby / server and then give them the directions on where your avatar is on the map to join. (gameondaily.com)