super easy to use.
put your birthday in the top, pick your sex, roll your face in the third box (or hit "RANDOM"), and press calculate.
this will give you a K. ID number in the left hand side.
Then go to flying petals (http://kimtaeyeon.co.kr), and choose "join" up top.
Once you put "THE CODE" that you get from the above generator in, it will fill in your birthday automagically... that's the first half of the code... "750101" is Jan 01, 1975, etc.
the second part is based on M/F, location born, then a hash (of sorts) against those numbers.
those last two check boxes are like... "release" and "disclose personal info"... i guess maybe they'll email you some stuff? I've never gotten any, but hey. whatevs.