How do I log in to my cPanel account as root?
You won't be able to log in to cPanel as the root user on port 2083. That is the cPanel user port. You can utilize WHM and port 2087 as the root user.
Within WHM, you can create accounts in the "Home »Account Functions »Create a New Account" menu.
Once you've created a new cPanel account, you can log in to cPanel on port 2083 with the new username and password. Alternatively, you can go to the "Home »Account Information »List Accounts" menu in WHM and click the cPanel icon by the domain to access the user's cPanel account.