Cricut Design Space Subscription

How do you get the 3  month Free Subscription to Cricut Design Space as described. I unpacked my Cricut and I have found no code or anything where I can get the subscription. I have a little set of instruction as to how to set it up by computer and/or IOS device.  I have a packing/return slip.  Thats it.   My Cricut account says I only have 4 more days of design space then its $9.99 month.   My Cricut Air was ordered 2/6/16.

Any help with this would be greatly appreciated.