Add new record from user register to another database

Hello all, I confuse with idea add Add new record from user register to another database, i modify in user_save() :
1)I test static variable ex: $myname="john elton"
$mypass="1234"
....
and used code insert to another database success when user register new user
but i want get these infomation ex: Name, pass from new user register form i only get variable pass at
case 'pass'
$mypass=$value;
then i cant get username (user register in Name on register form)
-Any can help me how to get variable from user register or another way to succes my idea at topic subject
Thank in advance