Iweb with www.mydomain.com

I have created a website using iweb and I have purchased a domain through www.mydomain.com.

I am trying to link the two together, so i sign into my mobile me account,select personal domain, BUT this message pops up

"Add Personal Domain

Before your iWeb site can be viewed at your personal domain, you must complete the following steps:

* Go to your registrar's website. Define web.me.com as the "www" CNAME (alias) for your domain.

If you need help creating a CNAME, contact your registrar.

* Return to this page and click Done.

Your registrar can take up to 48 hours to update your domain."

The problem is I have NO IDEA how to do this, if anyone can help with a step by step method that would be so helpful!!

Thanks,
SiSiJay

Thread moved to a more appropriate forum.

thread moved

to where?

have you tried calling them? I have a website hosted at godaddy and they sent me this link a video that showed me how to upload it step by step.