For cPanel & WHM version 58
(Home >> Account Functions >> Create a New Account)
Create a New Account
If the package that you select contains package extensions, you will see the Package Extensions section.
You cannot add or remove package extensions when you create an account in the WHM interface. To use a different set of package extensions, you must use one of the following methods:
Select package extension options
To view package extensions, you must select an existing package from the Choose a Package menu. You can then select the Select Options Manually checkbox to modify the settings for the associated package extensions. Any options or settings that you can edit will appear below each extension's name.
To find out more about your extension's options, consult the third-party software's documentation.