5.16.2012

TAP IN = ENTER IN/INTO

To enter information into a machine by pressing keys or numbers.
You just have to put your credit card into the slot and tap your personal identification number in.
-  To log in, tap in your user name and password and click on the ‘login’ button.

-  Enter your data in the proper field.
This phrasal verb can be separated.
Source: Knight's English