As an Admin you can create, edit or delete a role via User Management.
To create a new role:
Click on User Management from the left-hand menu
Select the "Roles" tab
Select "Create new role" from the top-right corner
Add the title of the role and Click "Save"
To edit an existing role:
Select the role you'd like to edit
Edit the role name and click "Save"
To delete a role:
Select the role you'd like to delete
Select the 3 dots in the upper left corner
Select "delete role"
Click "delete role" in the pop-up window to permanently delete the role