The answer you're looking for is in the "Docs" section of the top menu.

Update your database to your website's new URLs.

Direct link:
https://www.ubbcentral.com/forums/u...transition-your-forum-from-http-to-https


Current developer of UBB.threads PHP Forum Software
Current Release: UBBT 7.7.5 // Preview: UBBT 8.0.0
isaac @ id242.com // my forum @ CelicaHobby.com