At this point I am setting up a single forum. To go to it I am using what Documentation at codex.bbpress.org calls Method 2.
If either your theme doesn’t work with method 1, you don’t want permalinks with postname, or you want to use some introductory text (eg “welcome to our forums…”, then method 2 is for you.
go to add new page
Call this ‘Forums’ or whatever you want your menu item to be.
Then in the content section, you may want to have some introductory words “welcome to the forum” etc. then add the following bbpress shortcode