Google Apps authentication needs root server for my hostname.

[#1]

Forgive my stupid question.
Trying to setup Google Apps with my Plusnet domain.   Most of the authentication systems rely on my having to upload a file to http://mydomain.com
I only have a http://www.mydomain.com in my DNS records, and despite trying everything I can think of, I can't seem to create a record that points to somwhere where I can put the authentication file to Google needs to see.
Help!!!!!
I am currently attempting to use the CNAME version,  but the record that Google gave me has uppercase characters in it, which Plusnet reject.   I have changed it to lower-case, in the hope it might be OK, anyone know if this will eventually work, or am I on a road to nowhere with that method?

[#2]

Looks like this currently:

Left field	Type	Pri	Right field
www 	cname 	 	ccgi.plus.net. 
xxxyyyyzzzzz 	cname 	 	xxxyyyyzzzzzxxxyyyyzzzzzxxxyyzzxxxyyyyzzzzz.domainverify.googlehosted.com. 
ccgi 	cname 	 	ccgi.plus.net.

[#3]

Have you an A record set up to point to our CGI servers? e.g.

domain.com.              A                 84.92.1.4

Without that http://domain.com will be pointing to our Homepages servers (ftp.plus.net) rather than the CGI servers.