@ host record

I am trying to point my root host record to my public ip address that is the same as my www hosted outside of my network. I can't put in @ in DNS to represent that. I know at one point when you created a zone it would automatically create that @ record but I had to remove mine because it went to the OS X server hosting the DNS. Can anyone point in the right direction for creating a @ host record on Mac OS X Server 10.5?

Thanks