Before trying to change it again (and messing our site up like we did when we tried before), I tried the pinging. It gave me ping responses to anything that ended in sudsol.org (even things I knew didn't exist like dummy.sudsol.org). So that doesn't work.
I did find this website to lookup CNAME records's for a domain name:
http://www.mxtoolbox.com/CNAMELookup.aspx which is quite handy.
I'm getting No Records Exist, so I guess we'll try the just "forum" and see what happens (if I can get my partner to have the guts to try again! She's gun shy with these types of things and having the problems we had before make it hard for me to convince her!)
Thanks,
Coleen