If you mean Push Internally to another User -
Go to "Manage Domains"
Check the Box Beside the Domain you wish to "Push"
Then click on the "Change Account" Button Above list of Domains -
then the Whois/Contact Info etc... Should be on right Side and Down the Page ~ Fill in the Persons Info who will Receive it Here (All Whois info is Important - But the Email is the most Important to make sure New Owner Receives the Push Initiation
Hope this Doesn't Confuse you more ..... Good Luck ~