How to access cPanel accounts through WHM:
1) Find the 'Account information' section.
2) Go to 'List Accounts'.
3) Next to every domain name, there is a cPanel logo. Clicking on that icon will take you to the account's cPanel logo.
4) A warning is seen in red notifying the fact that you have logged in as a reseller or as a root.
5) With the drop-down menu you have the ability to switch to other account you own.