How to link a forum with a wiki page
I notice at the bottom of my wiki pages, there is the option to "discuss". When clicked, an error message is shown indicating that "No forum indicated". My question is...how do I make this button actually take one to a forum where one can discuss that page? I think it's a great feature, but I can't figure out how to activate it, and I don't see anything in forums or the wiki page itself that indicates how to link the two.