How to register CTC 101

I just received my CTC 101 Full Program Kit. It says to login and enter the registration code. Can anyone tell me where to enter the registration code? Thanks.

I'm guessing this is the related issue report in the bug tracker:

Hello,

Inside the kit there should be a sticker explaining how to register online. If you are experiencing further issues, please, drop us an email to ctc.101 (at) arduino.cc

We should be able to assist you.

Best,

Hello,
have you check this?