With Hostmonster simple DNS zone editor you can do the following with your domain names:

Add/Delete an A Record:

A records maps IP address to subdomain or domain name. For example you may have example.example.com (replace example.com with your domain) to maps to other specific IP address rather then the IP address of your domain name.

Add/Delete a CNAME Record:

CNAME is short for canonical name record. This record creates an alias, allowing a querying server to continue the DNS lookup under the new name.

This is very useful tool because you it allows you to change the record directly inside your control panel.