My wiki is a roleplay wiki made for role playing, and I was wondering how to make a forum like what this message is on so the people on my wiki can roleplay here instead of in page comments . Anyone know how?
You cannot. Forum is considered a deprecated feature and cannot be enabled/re-enabled on wikis. As a matter of fact, Wikia plans to start forcefully disabling it for remaining wikis starting mid-January. After that, it will be like the feature never existed; so they say.