Basic steps to push your domain name to another user in GoDaddy if the domain name is registered at GoDaddy.

Login to your GoDaddy account.
Select the Domain name.
Click on the Account change Button on Top.
Fill in the details of the New Owner. To whom you want to push the domain name.

Check your email.
There will be the instructions in it for the accepting the account change.
OR
Go to your GoDaddy account and click on Accept an Account change.
Fill in the Transaction ID: and the Security Code: That was provided you in the email.
Your cart will be having the domain name with $0 purchase check out with your choice of payment processing gateway.

nice info admin. will surely help me in pushing my domains to other users in godaddy. i always used to ask for help here and there on the forums whenever i used to sell a domain name. this push tutorial is bookmarked.