I got there 10 or 20 minutes later, then went into the community chat (which is where we were supposed to meet). I waited for people to come into the chat, asked why they were there, and if they were for the forum party I added them to my friends list. Then you get a few of the people and make a game, and you play it. Then you meet back at the community room thing, and see if there are any new people from AoMH, then you add them and let them be in your next game.
After your first forum party, it's probably easier to tell who's who since you already have quite a few of the AoMHers on your friends list.
Also, you could have gone to the "ESO names" topic and added a few of us.