The CHMOD changing/setting file/folder permissions from File Manager feature offered by cpanel video tutorial shows how to do this action in three simple steps:
1) Go to cpanel
2) Scroll down and point to File Manager. Choose your website’s public html folder
3) Now check the box on the left of the file/folder you want to change attributes and a kind of popup will appear and ask what permissions you want to set : we’ve used chmod 777.