If you did not buy your domain name through Watch the Dot, but wish to point it at Watch the Dot hosting, you will need to update your domain name Name Servers. This is done through the Domain Management Panel with your domain name company.
The settings for the Name Servers should be set as follows:
Name Server 1 (NS1): ns.mainnameserver.com Name Server 2 (NS2): ns2.mainnameserver.com
If you are havinng problems updating your name servers with your domain name vendor, please raise a support ticket and we will try to advise further.