Add a DNS record in WHM:
Log into WHM.
Navigate to "DNS Zone Manager."
Click "Manage" to the far right of your domain.
Click the drop-down menu on the "+ ADD RECORD" button and select the desired record type.
Fill in the desired values for the new DNS record and click "Add Record."

Add a DNS record in cPanel:
Log into cPanel.
Navigate to "Zone Editor."
Click "Manage" to the far right of your domain.
Click the drop-down menu on the "+ ADD RECORD" button and select the desired record type.
Fill in the desired values for the new DNS record and click "Add Record."