Hi, you'll need to take the following steps:
1. find the name(s) to be pushed
2. select the name(s)
3. unlock them (I heard it can still go through without unlocking but the godaddy system is pretty buggy, so I've always done this)
4. click on the "account change" (located in between "nameservers" and "cancel")
5. fill in the new owner's info, the most importantly, his/her email address. Confirm the info.
6. you'll receive a email telling you the name is leaving your account
7. the new owner will receive a email asking him/her to accept the name
8. he/she confirms it
9. the name should be now gone from your account! (you'll also receive another email from godaddy confirming this )
Hope this helps.