Welcome, binnip! It can be hard to find a game on the forum like this. The best thing to do is use the JOIN A GAME feature from the "Games" drop down menu at the top of the screen. You can use it to search for the game that you want to play and it will show you all of the open games that are currently seeking players. I'd advise you to be wary of games without a set Dungeon Master/Game Master that feature 100 players. You want a single game with no more than 4-6 players in the group. Once you find one, follow the instructions to apply and the DM will help you from there. My guess is that you want to join a current Dungeons & Dragons game, so you want to search for "D&D 5E" in the game search window. Good luck!