You will need to log into cPanel with your supplied username and password. Normally this URL is: http://www.yourdomain.com/cpanel
1) Select the Password field and enter your password
2) Select the Username field and enter your username
3) Now click on the Log in button
4) Scroll down to the Security section and click on the HotLink Protection icon
5) Enter all the sites you wish to protect here
6) Enter a redirect URL to create a custom message to be displayed instead of the standard 403 error
7) Click the Submit button to save
You now know how to enable Hotlink Protection using cPanel