Assign the Anonymous Group to the Anonymous Role
From the Members tab, assign the anonymous group with the anonymous role in your project. Click Add new Group and Select Anonymous from the Groups in the Step1 section and then Anonymous Role from the Roles section (Step2), click Add.
Figure: Assign the Anonymous Group to the Anonymous Role.
You will see the Anonymous Group with Anonymous Role on the Members page.
Login as anonymous/supersecret and test the permissions you are granted. Change the password supersecret to your own password for security reasons.