Setting up DNS with ISPConfig trouble

[carrorcake]

I'm trying to set up the DNS on my server I just bought from Rackspace cloud. When I configured everything on the server I didn't specify a domain so I just access the ISPConfig page through ip.address:8080

This is fine, but I'm confused on how to add my other domains on here, and then use their DNS settings.

Could anybody point me in the right, direciton?

Thanks