unlock the domain you want to move then select it again and click move account. You will then be prompted for new whois info and the user id you want to move the domain to. Then a email is sent to the new account holder asking them to accept the move i believe.
don't worry, just go to My Account > Manage Domains > Your domain has to be unlocked. If so then select your domain and click on Change Account (First row in the middle). The rest should be easy. Good luck.