Create Account in WHM
From Lunarpages Web Hosting Wiki
This is how you would create an account using Web Host Manager (WHM). This way you can host new domains and create new cPanel for each account you wish to host under your dedicated hosting plan.
The first thing you would need to do is login to WHM. From the front page, click on "Account Functions" and then "Create a New Account".
This will take you to the Create a New Account page. In the text box marked "Domain", type in the domain name you wish to create a hosting account for. WHM will automatically create a user name for you based on the first 8 characters of the domain name.
Remember, a user name can not start with a number.
Next, create a password. Make it 6-8 alpha-numeric characters and it should not contain the user name. You may set all the limits manually or select a pre-configured hosting plan that you have already created. When doing so, all account limits will be automatically set based on the package selection.
In the last box, be sure to fill in a contact e-mail address. Scroll back up to the top of the page, and then click the "Create" button to create your account in WHM.