Step 1: Login to cPanel
Step 2: Enter your username and password. Click the blue login button to log in to the main cPanel page.
Step 3. Once you’re logged in, locate the "Databases" section of cPanel. Within, there is an icon for "MySQL® Databases". Click on the “MySQL® Databases" icon.
Step 4. In MySQL® Databases under “Current Users”, click Rename under the “Actions” column.
Step 5. The Rename Database User dialog box appears. In the New name text box, enter the new name for the database user.
Step 6. Click Delete User button and cPanel deletes the database.