If it's in the 1st 60 days from registration I don't believe you can. Most registrars require 60 days from registration date before they will authorise a transfer.
If/when 60 days are up then click on "Domain Names">"Transfer" in the left column in the Enom Control Panel and follow the procedure as instructed.
There is a chargeback window for credit cards. From what I heard the 60 day period protects registrars from chargebacks after a domain is transferred. That makes sense (to registrars).