Log in to your Seller Central account

Navigate to User Permissions under Settings
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You will be redirected to the User Permissions page. Under the list of current users, delete the one you want.
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Log in to your Seller Central account

Click on Manage Permissions under Settings
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On the Manage Permissions page, click on the "edit" next to the user whose access you want to revoke
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Choose "Remove this person" to complete the process