Hi,
You can register domain names in the billing center at this link:
https://canadianwebhosting.com/login.asp(The login information is the same as your control panel if you have not change it.)
Select-> Accounts (at the top), new domain name (on the left)
Enter the domain name you want and submit.
Please let me know if you have any other question.
Henry
Customer Support
Canadian Web Hosting
1-888-821-7888 Ext. 7012