1. Make sure that the domain name you're trying to transfer is not in 60-days period after registration/push date to Enom (if so, transfer will fail).
2. Unlock the domain name via Enom control panel (after that, there won't be 'Registrar-lock' at the WHOIS data).
3. Obtain authorization code (also referred to as an auth code or an EPP code) via Enom control panel.
4. Login to your account at GoDddy and initiate transfer -- you'll need to enter domain name and EPP code.
5. Carefully read e-mails with further instructions (you'll get them both from Enom and GoDaddy).