First, I should mention that anything directly related to a specific theme should be posted in the forum category for that theme. I moved your topic here to the Encounters forum.
As for setting up a members forum…this theme does not include anything for a forum, although you can certainly set one up if you want one in your website. I’m going to guess you are planning to use bbPress? The only thing I can do here for you is to say read up on the documentation and follow the instructions.
My next theme I am working on will have theme styling for bbPress, but unfortunately I do not have one for Encounters.