To deactivate/reactivate a user, please follow the below steps: 

1. Click on My Account in the top right corner of the home page
2. Navigate to the User Management tab
3. Select the use you would like to deactivate/reactivate out of the list of users. Deactivated users will show in the inactive user section
4. In the profile of the user, click the Deactivate/Reactivate user button
5. Click through the confirmation
6. The user has now been deactivated or reactivated