adding subdomain of another site as addon to my example.epizy site

Hi there,
I need little support about adding a new subdomain of my other site to my, I am trying to add it as addon URL because from now I want to use my as primary URL on my site.

I’ve already pointed my servers to and When I try to add my it says domain not registered.
Please guide me.
Is this going to change my site’s address permanently into

In this example, is “” a domain name you own and “” a subdomain of that domain you own?

If so, you will want to add “” as an addon domain to your account. After you’ve set that up, you can add “” to your account as a Subdomain.