Go to the Admin options (only site administrators can manage users):
Select "Mange people" in either the "Administrator" control panel as noted in the screenshot or in the left column under "People settings" - here will you see a list of users in the site. Find the user you wish to deactivate and click on the Access and Alerts link under their name.
Update the user status to Deactivated and click "Update user." This user will no longer have access your site. If you ever need to give them access again, you will follow these same instructions and update user status to Active.
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