I don't think there is a way to share a link.
If you have one of the e-ink kindles, from the Home page, you can hit menu, then "Show Special Offers."
Mine shows three pages worth - on page 2 I saw the music offer, clicked on it, then you have to click on "Email Me this Offer."
Once you get the email, you link back to amazon and get the credit.
Much faster/easier than I've made it sound, I think...
ETA: actually, the special offer was on page 3 for me
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