Sign in to your Buffalo hard drive’s web interface.
Go to the Settings section followed by File Sharing.
Click the widget button available beside the Users option.
Go to the Create User tab.
Now, a dialog box titled User Settings will open.
In the opened box, type the required details correctly in the corresponding fields.
Once the new user account is created, it will be displayed in the User List.
Now, locate the newly created user account, and click the Edit button beside it.
Go to the Access Restrictions section and configure the admin rights.
Finally, save them.