Hostname and DNS settings question

In the virtualmin setup wizard I just finished setting up bind9 and it has a checkmark for being ready.
but i need my Hostname and DNS settings

Should i change hostname gfxhideout_1337 to

And put in my name servers

Any other setting in Hostname and DNS ?
Or point me to a help file i jut seem to find one.

And on my domain registrar should I change my namesevers from ns1 ns2 to ns1 ns2 ty

Change my bind9 settings from ns1 ns2 to ns1 ns2

The check mark on bind dose it cake sure the settings check out or dose it just check the required fields