How do I deactivate (or reactivate) a user?

You can search for the user by name in the search bar (upper right hand corner) > click on the user that needs to be deactivated > under Recent Activity click deactivate or visit your Users page and click the "deactivate" link to the right of the user's name.

That user will no longer have access to your JobScore account. You can re-activate them at any time by clicking the deactivated users link at the top right of the users page and then clicking the reactivate link in the actions column in the table.