Once you've set up your roles, the next step would be assigning users to that role.
To assign a user to a role, go to the Users page and click on the user you would like to add to the role:
From there, you can assign the user to the role from the dropdown at the bottom of the user's details page:
Select which role you would like to assign them to and click the green save button. That user will be assigned to that role, with all permissions effective immediately.
Important note: If a user is not assigned to any role, then they will default to Admin status.
Not sure how to set up a role? Click here.