The supplied domain name is not well configured

I bought my domain from http://www.webs.com, all well and good, everything works fine. In the Domain Management, there are five tabs; Whois (information about the owner of the domain (me)), Nameservers, Records, Autorenew and Privacy Protection.

When I go to the Records tab I'm able to set up a CNAME, but I'm assuming I'm doing it wrong because when I try to change my address on my https://www.forumotion.com forum, it doesn't work and I get the following message:

The supplied domain name is not well configured.
You have no CNAME redirecting to: pitbullclan.forumotion.com.

There are four fields within the Records tab; Host, Address, Record (either MX or CNAME) and Priority.

I want to change the address from http://www.pitbullclan.forumotion.com to either http://www.pitbullclan.eu/community or http://www.community.pitbullclan.eu.

My domain is http://www.pitbullclan.eu and My forum address is http://www.pitbullclan.forumotion.com.

Can someone please help by telling me the values to put in each field cause this is a real pain in the ass!