Go to your list of domain names and click on the one you want to change.
At the very top of your screen, you'll see DNS Server - current status: eNom
Click the "change" button
Check the radio button for "user" and click save changes
You will then see 4 boxes where you can enter your own servers... enter
and you should be all set.
It will take a while for it to resolve, so be patient.
Good Luck
Jennifer