When you create a website select the "I will use my own domain" option under the Domain dropdown menu.
Once you have done this you must set the IP address of this domain to point to the IP address of the MyEduWebsite server hosting your website. This will be shown on the page once you have created the site.
In your DNS settings, you can either forward the site using the A or a specific CNAME record. If you use a CNAME www record to forward www.yourdomain.com you must ensure that the domain you enter in the "I will use my own domain field" includes www.