Look for an invitation email that looks like this:
Go to the link within the email and follow through with your account setup.
After creating your account, go to your dashboard and create a new workspace. Make sure your workspace options are set like this:
Open your cse202 workspace, click on "Share" in the top right corner, and share your workspace with csusbdt and markswoope. In the screenshot below, I can't share to myself so pretend my name is below csusbdt in the access list.