Slash commands broken

As of today, the /slash commands in my server are no longer working. Online, I found there's a new "integrations" tab in the server parameters where I'm supposed to be able to add roles and channels permissions for particular bots. However, my UI doesn't have "add roles" and all of those Command permissions, which I saw existed on Youtube videos from people part of the experimental Command Permission system.

Basically : An update broke the commands for my Bots, but my UI doesn't allow me to fix the problem... Please help!