You can add many useful functions to your website by installing pieces of software called cPanel addons. Your web host controls which site software is available for you to use with your website. Contact your web host for more information about adding site software to your account.
To manage your addons, click Site Software. Here you will find the addons which are allowed for your account. To install an addon, click its link.
Most will require you to type in your username and password.