Can not Change CNAME for [AdSense for domains]

I am trying to change my CNAME record so I can use google AdSense for domains. ( When I try to change the record I get an error saying “CNAME records may only be used on sub-domains.”

What am I missing?

Put [color=#0000CC]www[/color] in the first field (www is, in reality, a subdomain!).

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How To Install PHP.INI / ionCube on DreamHost

Thanks. I found that there was already a www sub domain and it would not let me add it. The way I was able to get around it was to add a dream host parking page, then turn around and delete it. Once I did that it would delete that www sub domain and I could add the new CNAME record.

Thanks for the help.