That NXDOMAIN error sounds like you haven’t added any DNS record(s), such as AAAA, A or CNAME on the given (sub-)domain you’re trying to reach.
At the moment, there are no DNS record(s) for www.danielandkelly.org.
If you need the “www” variant to be functional, you will need to add DNS record(s) there as well, according to the instructions you can obtain from your hosting provider.