Trying to link to domain

I'm trying to link unblocking.ezyro.com to unblocking.icu, so I set the name servers to ns1.ezyro.com and ns2.ezyro.com, and typed unblocking.icu into the "Create an Addon Domain" page, but it says "unblocking.icu is already assigned and in use.3" but there is no folder on the server to put the files on.

Edit: solved, i cant figure out how to dlete posts.

Thanks.