How do users use the support system?

I'm confused about the Support System plugin. I'm using Buddypress and the Membership plugin to create a paid community. I'd like to have a "Support" page where members can go to create tickets, but I don't even know how to set that up with this plugin.

In the settings, under "User roles that can open/see tickets", I don't even have an option for administrator. Can someone provide some advice on how to set this up?