Start by logging into the registrar where you had purchased your domain. From there, navigate to the DNS Management section of your desired domain. Please use the help section of the registrar if you do not know where it is. Once in the DNS Management section, change your "@" A-Record to the IP address associated with your uwwweb server.
To get the IP address, go to https://www.uwwweb.com/hosting. If you're not logged in, you will have to do so. This page will redirect you to a listing of all your Hosting products. Click on the "Product Settings" button on the hosting package that you wish to view. From that page, you can see the IP address of your server.