( newb ) Question: Account Creation

Alrighty then...

I have recently stepped into ownership of a VPS.
I have domains from a previous dedicated server that were transferred to my new VPS.

Currently, all of the previous domains are listed as parked SubDomains of the main account.

What I am trying to wrap my mind around right now is CPANEL. I have downloaded and read through the WHM and CPANEL User Guides. But, I cannot seem to get a cpanel account setup?

For instance... I have domain ABC.org parked at ABC.XYZ.com

When I visit www.ABC.com I get the right site. So the parking is working.
But if I go to www.ABC.com/cpanel then my username and password just AIN'T working...

Can someone help me out here? I am quite lost...