Everyone in a moderated session uses the same link to join the session. Roles are determined based on if you have a login to UserZoom GO or not. You can read more about the different roles here.
Participants do not need a login to join a moderated study. Once they have gone through the System Check you will see the participant in the waiting room.
When Moderator is ready, select a test participant from the dropdown list, then click the green Start Session button.
They will then join the session as the participant and you will see them on your screen.
Note to start the screen-share make sure to start the recording!