After registering, you'll be invited to a Discord channel. Discord is a computer program that allows for instant messaging, file sharing and video chat. It is an app used by a lot of educational organisations. You can download it here.
Your tutor will have a channel set specifically for your class. You'll be able to message the tutor and your classmates there.
Your tutor will also run lessons via Discord, where they'll be able to share their screen, as well as send you resources and worksheets.