You need to update the following file:
/etc/wwwacct.conf
Output example:
NS yournameservhere.com
CONTACTEMAIL
HOMEDIR /home
ETHDEV eth0
NS4
SCRIPTALIAS y
NSTTL 86400
ADDR6
TTL 14400
HOST yourhostnamehere.com
LOGSTYLE combined
CONTACTPAGER
DEFMOD paper_lantern
ADDR 11.22.33.44
NS2 yournameservhere2.com
DEFWEBMAILTHEME paper_lantern
HOMEMATCH home
NS3 yournameservhere3.com
As you can see you can set up here default theme to use (change theme from “jupiter”), nameservers, etc, so you can quickly set it up here without visiting WHM panel