Subdomain help

[AHarvey]

Hi all,

Had an email from a work friend, I think I understand what she is saying but yes, I can build websites but I am totally lost with domains etc sO i thought I'd ask you guys:

emails says:

I seem to be having problems with fasthosts subdomains =(, my subdomain is only acting as a mask & using bloody framesets to redirect. So when anyone f5's it reloads the index page =/

All fasthosts have said is:
"The only work around for this is to point your domain to a different nameserver, to a host where you can create a real subdomain. And then you can point back the domain to our system via A-record and MX-record for website and email hosting"

So are they saying id have to pay for another domain & then use their 'subdomain' to point to that? .. if so why am i paying them for a service if I cannot create actual subdomains *confused look* .. or am i misundestanding the whole situation? lol

Anyone any advice for her or can answer her question?