Step 1: Login to your Drupal admin account.
Step 2: Go to the People page on top menu.
Step 3: Click the Edit link for the admin account.
Step 4: Enter the new username you wish to use.
Step 5: Click save to apply the changes.
Step 6: That’s it! Next time you login to the admin account, make sure you use the new username that we just set.
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