Good question. You cannot do this yourself, but I can for you. Let me know what you want me to change it to (e-mail
support@foodclub.org).
The initial forum name gets set to whatever the source title was when you enabled phpBB integration. (with the leading "Account: " added) It cannot be changed later except my a phpBB admin, which no Foodclub users get, in order to make sure the forums work for everyone.
One reason there is no existing support forum topic, or FAQ item for this question, is that not too many clubs actually use the phpBB forums. There are just a few clubs who are very active on the forums, and they have it all set up the way they want, but most clubs don't use their forum yet. Maybe that feature needs to be promoted better, but also in my experience, most clubs just use an e-mail list and don't need/want a full discussion forum.
Anyway, you're right this question should be documented somewhere, so I am moving this topic into the main Support forum.