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Click on offer, then click on the link on the offer page to receive an email with the promo code. Sign-up for this offer expires on April 8.
You'll get an email (right away), a link to the Special Offer page and a promotion code to enter at checkout. Once you have the promotional code, you have until May 8, 2012 to complete your purchase. Like previous offers, this one requires you to use the full checkout process in order to enter your promotional code. Also, like all Amazon sales that use promotional codes, if you have a gift card balance, you must use it for the payment (if there is not a sufficient balance, then you can pick which credit card or other payment to use).
Limit one offer per customer and per device.
Shop early, of course, as their selection often dwindles as the offer goes on. This is another bonus offer, that isn't on the "normal" schedule (every 4 days, although some dates now get skipped), but it's also one that gives you plenty of time to sign up for it. If you don't see it on your Kindle, first try leaving the WiFi on for an hour or so and, if that doesn't work, try doing a Restart from the Settings menu (not a factory reset, though).