You can change the role of any active person at any time from diio settings → People.
Go to diio settings → People and click the person.
To change their role on a team (Executive, Leader or Coordinator), open the "Teams" tab and check or uncheck the role boxes for each team.
To assign administrator roles (Main Administrator, Teams Administrator, Billing Administrator or Settings Administrator), open the "Permissions" tab. Only the Main Administrator can see this tab, and it doesn't exist on the Starter plan.
Click "Save changes" on the tab you edited. The change applies on that person's next login or when they refresh their active session.