This is the main screen of the control app. on this screen you can see the apps which you did set rules for. Tab on the app-name to go go to the view where you can edit rules.
Swipe across the app-name or tab the Edit-button to delete an entry and with it the rules for the app.
Tab on Edit and then on the appearing "+". Now you can manually add an app and set "Allow all connections"/"Deny all connections" for it.
Tab on the "i"-button and you'll see the about-view. there you find additional information as well as an switch to disable Firewall iP. You can also use the toggle in SBSettings (if installed) for that.