- Login to cPanel account at http://{ip}/cpanel or http://yoursite.com/cpanel.
- Click "File Manager" under Files column.
- Find the file or directory which you want to modify its permissions, click its name.
- Click "Change Permissions" button.
- Set the correct permissions and click "Change Permissions".
IMPORTANT:
Changing file permissions might cause your web site being vulnerable to attack. Please ensure that you know what you are doing.