You can rename any file you've uploaded to your Linux Hosting account.

From your client area go to:

Services -> My Services -> click on the green "Active" button -> Login to cPanel/Control Panel

In the top left-hand corner of the account Dashboard, select File Manager.

In the cPanel File Manager, navigate to the file you want to change, select the file and then select Rename. Enter the new file name and then press Enter/Return.

More info: For more help, see the cPanel documentation for File Manager.