airberlin topbonus - How do I get BAEC points and TPs?

It seems flying Air Berlin into Germany may be quicker and more cost-effective than flying BA via LHR.

In doing some "dummy bookings" I cannot see how to enter my BAEC number and password into the AB booking engine. How to?
TIA :)

How hard did you look?

Click the link "Please enter your Frequent Flyer Number" directly under the fields for entering the passenger name, and select "British Airways - Executive Club" from the drop down menu.

http://i46.tinypic.com/t720b9.jpg

Thank you for showing me how AB follows the KISS principle :D