Every Nabble forum is independent of each other so registering on Nabble Support has no impact on what you do with a forum you create on their platform.
See my set of posts at:
http://greghelp.991552.n3.nabble.com/Administrator-s-Guide-f4012830.htmlthat provides lots of guidance for new forum administrators.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.