77a. You need to pay your DM to play, either on a monthly basis or a one-time payment (in advance) for a specific number of hours of play.
77b. Alternatively, you can play for free, but only if the DM isn't too busy, and the DM will interrupt the game regularly to tell you that if you pay him, you can play any time, and you can also get more gold and access to better equipment, classes and quests.