If you've created an Activity and would like to change a participant's role, find out how.
Accessing the user list
From your Activity, access the user list.
đź’ˇEditing mode available for the following activities: Session, Quiz, Survey, Adventure, Memo, Mission and Board.
Role modification
Click on the 3 small dots at the end of the user's line.
Then select “Turn to co-author”.
The change is immediate.
To find out more about the different user roles, see this article: What are the different roles of activity users?