How do I create a HTTP Pull CDN resource?
Navigate to 'CDN Resource' and click the button "New CDN Resource"
Select for HTTP, and select "Pull" at content origin field. Fill in your desired CDN hostname and your website origin server where the content hosted, and choose "HTTP Pull". Tick the checkbox of the edge groups you wish your content to serve from.
Click "Create CDN Resource".
Then you need to create the CNAME for your CDN hostname on your DNS registrar, as per instructions.