The Website URL is the URL which needs to be blocked.

For example, if you need to block http://mywebsite.com then the website URL will be http://mywebsite.com

Use your domain name if you plan to block your entire website or use a particular page URL if you plan to block that page only or all its sub pages.

For example if you need to block http://mywebsite.com/blog and/or all its sub pages, then the Website URL should be http://mywebsite.com/blog