"Hushed.com" How to access recent US$25 "Lifetime deal" (via SlashDot.org ad)

Got a list of recent SlashDot.com story titles via eMail, & just after I opened it, I got a Lifetime Offer from Hushed.com

(Oddly, enough, this was a day or 2 after the 19 y.o. American-Israeli was arrested, in connection with Threats to Jewish Community Centres around the world. I mention this bit of trivia, as he used Internet to hide or spoof his phone no. to make all those disruptive threats.)

Hushed was new to me, so - before actually using the voucher - I went off to read about it.

When I came back to find out how to use the voucher, the ad was gone!

Now, I have only the voucher code… but I don't know how & where to enter it.

Purchases from within the app tap my iTunes account, but none of the options (of what I can buy) is the Lifetime deal, of the offer.)

Has anyone used a similar voucher before? Maybe the procedure is same? (while voucher has changed?)

Thanks… :-/