I installed this plugin and got to the point where I was configuring the main required options. I messed it up the first time, with the wrong db name, and got the standard WP error, “Can’t select Database”. I went back to change it, and now the WPHPBB config page has the same “Can’t select database” error where the submit button would be, prohibiting me from changing the bunk settings. I uninstalled, re-uploaded and re-activated at least a couple times, and the same page is there. What can I do to go back to the clean slate?