I think Frank said this offer finishes on the 22nd.
I don't know If that is the 22nd am or midnight maybe, so depending whereabouts in the world you are, it may have finished.
I was unable to sign up using the code entered into the code box, which is how it is usually done. I just happened to see an ad on my computer which I clicked on, and the discount was applied that way.
Others seem to have had varied success using the discount code, so for some reason it does not seem to work for some of us.
I hope someone can work ou through this step by step before the offer finishes.

These discounts still apply if you have had previous subscriptions or other discounted offers.
Sorry I couldn't be of more help.