2 Websites on 1 IP Address (dedicated Server)

I currently got 1 website hosted on my dedicated server. And I am using my domain register's DNS (not name server's).

I just added my second domain by going to Add Virtual Server under Virtualmin

Now I see 2 folders under /home/

My questions is, how do I set the DNS for my second website? Becuase currently my first domain is using Dynadot DNS (my domain register's DNS)

If I do the same for my second domain, Dynadot DNS and point to same IP, wouldent there by 2 websites using same IP and same Dynadot DNS? How does that worK?

How would I host both of these on 1 server, I know its possible but I just dont know how,

Or do I use Namesevers for 1, and Dynadot DNS for the second.

Help :)