[Solved] wpForo took over my Wordpress log in page
As the admin, you should still be able to see the admin bar at the top of the site. If that's not there, then I can see how you might be a bit stuck and panic!
Once you are logged in via the wpForo login, just enter the admin address into the browser address bar https://www.yoursite.com/wp-admin/
What you could do is use a plugin called Nav Menu Roles. You can add things to your site menu that are only visible to those logged in who have a certain level of user access. So on my site, I have a menu item for the admin page and it is only visible to admins who are logged in. Much easier if you ever lose the admin bar for some reason.