If your domains are under the control of your other host, you will need to get them to change the nameservers to whatever your new nameservers are. That may or may not be easy to do as sometimes once the domain has been hosted somewhere else, they aren't as interested in helping you.
I would recommend you get that domain transferred to an independent domain registrar so you have more control over making these kind of changes. I use name.com - very inexpensive and they have a great interface for working with your domains.
Get that done first, and while you're waiting, work on getting your files set up at WHM using your ip address for ftp. And as soon as your domain shows up in your new registrar account, you'll be able to change your name servers yourself.
Colleen
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