Wouldn't be able to do that, sorry. Perhaps a new one can be built? If you are interested, PM me! I'd be glad to feature it & we can have the other one taken down.
Correct that's how it works. You would then be able to click links that have that subdomain.
If you don't mind, please open up a support ticket so we can check your specific account for issues with the DNS.
It should be solved as of last week. That said, you might still have a caching issue on your browser end (HSTS)
To fix:
Open chrome://net-internals/#hsts from within a chrome using address bar
Under "Delete domain security policies" type in adfoc.us and then press OK
Exit Chrome and re-open
That's not the correct way to configure. Please read the instructions:
So you need to set name to "windof" as the name, target as mydomain.adfoc.us (this is literal, do not replace "mydomain") and you then would access windof.<yourdomainhere>