Supervisors have special access to other user accounts (see Supervisors for more information). You can add and remove supervisors at any time from your account summary page.
My Account link
To access your account details page hit the profile icon in the top right corner and select "My Account".
On the account details page you'll see a region called "My Supervisors". Hit "add supervisor" to add a new supervisor.
Add Supervisor dialog
Add a new supervisor by entering their name and then hitting "Add Supervisor".
List of supervisors
You can modify the list of supervisors for your account by hitting the name of any supervisor in the list.