You can enable or disable a book's Forum from the "Forum" page you can find here:

https://leanpub.com/YOUR_BOOK/forum

A forum is only visible to people who have bought your book, and if the forum is enabled.

You don't have any special admin privileges in the forum itself - you're just like any other user who can create new topics and make contribute comments!

You can also find a link to the Forum page under "Community" on your book's Overview page:

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