cPanel Hosting Manual:

Logging on
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MySQL
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Bulletin Board
CGI Center
Scripts Library
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Network Tools
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HotLink Prevention
Index Manager
IP Deny Manager

Removing a user's permissions

A user will no longer be able to access a particular database when you have removed their permissions to that database.

To remove a user's permissions:

1. Click on the MySQL databases button on the home page.
2. Click on the Delete button next to the specific user underneath the name of the database in the Databases area.