Under Manage Domain, I added a custom DNS record:
Name: (I left this blank)
Value: (I entered the IP address I wanted it to redirect to)
It redirected only when I searched mydomain.com, NOT when I searched www.mydomain.com
So I deleted this custom DNS and redid it last night typing www when it asked for Name: www
Now when I try to search either mydomain.com or www.mydomain.com, I get an "Oops, this link appears to be broken" message from my browser.
I hope this isn't too confusing.