From your dashboard click the Admin icon on the navigation bar.
Under Managing Users you are able to choose the user you wish to edit
Click “Edit” on the desired user
Scroll to the bottom of the screen, click the “Deactivate” button.
To reactivate a user:
click on the switch "Show deactivated users." This will turn blue
Locate the deactivated user in the Managing Users panel.
Scroll to the bottom of the screen and click “Reactivate User.”