You can create a cPanel account within your WHM reseller by doing the following:
- Login to WHM
- In the top left hand search field, search for 'Create a New Account'
- Fill in the fields (Domains, Username, Password etc)
- Scroll to the bottom and click Create.
You can then login to the new cPanel account by searching for 'List Accounts' in the search field.
This will list all the accounts on your reseller.
Click on the cPanel Icon which will take you into this domains cPanel account.