Dear emohawk18074,
It is in 2 step procedure
Step 1:
Configure the DNS of the domain
www.yomv.co.uk to point to
ns1.x10hosting.com
ns2.x10hosting.com
Doing this will get the rador of the top level domain to the pool of X10Hosting servers.
Step 2:
Go to your cpanel and add the Addon Domain to your hosting account.
Here is a Video on how to do it
This means that from the pool of the X10servers, you will get that domain come to your hosting account.
Thats all and you are done.