[@netweb Keymaster 13 years, 8 months ago]

@jiapei100 From the codex docs https://codex.bbpress.org/import-forums/#getting-there

• Log in to your WordPress Admin Dashboard
• Select the ‘Tools’ tab select ‘Forums’ from the navigation menu
• Select the ‘Import Forums’ tab at the top of the screen.

You then need to follow the next steps in the docs linked above for your settings.

Don’t forget to read the docs on Mingle and let us know any issues you find.
https://codex.bbpress.org/import-forums/mingle/