I'm not to familiar with shaw, but it will really depend on finding the DNS id's for your shaw account.
Then take the DNS Settings you get from shaw (should be two or three numbers) and then use them to overwrite the DNS settings on your domain account. (assuming you went with a domain provided that wasn't shaw). That should tell the domain to start looking at your shaw account for the correct info.
I'm not sure if you've been able to get that far, but feel free to PM if you have more detailied info.