Server :: Postfix Standalone To Mysql Upgrade?

I did a basic U9.10 server install of postfix with the minimal config. Added a test user and things worked after a few minutes. I now want to setup a few new things and want to switch to use mysql as the back-end. I have mysql installed, setup postfix.admin which in turn setup the database/tables. Now when I logged in to that admin, the original test user is not there (which is fine), but I created the test domain again, created a user and an outside test failed saying user unknown.

Now I looked through the main.cf page and don't see anything obvious to say hey, put backend is mysql, here is the info. I then noticed via apt that postfix-mysql was not installed, so installed that, I see my .cf was backed up, but still don't see anywhere to connect the 2. So currently mail is still accepted from the test1 user running local. I don't mind wiping everyhing, but is there a simple place to just make a change or 2?