1. For this please login to your Control Panel http://domainname.com/cpanel
2. Now click on File Manager option.
3. Select Web Root (public_html/www) directory option in order to goto public_html folder.
4. Click “public_html” folder name.
5. Click on “Upload” option from top menu.
6. Click on “Choose File” button and select the file from your local drive, after selecting file upload will start automatically .