Manage own domain

[kurdak]

Hello.
I have a problem with my domain.
On the server I have installed Deian lenny.
Domain server is debian.xxxxx.zz.
IspCP to log in to admin.xxxxx.zz, but how come I have my xxxxx.zz on the same.
How do I manage the domain xxxxx.zz.
Thank you for your help.
Sorry for my poor english.