Originally Posted by Akirainblack
By disable special offers are you meaning the "New on Kindle" at the bottom of the main page when in cover view?
Oh and great to hear you've finally got your paperwhite.
No, I mean the ads of the SO version. IIRC, you have a japanese one, so this wouldn't apply to you anyway (AFAIK, the SO versions aren't sold in Japan).
To disable the annoying "recommendations" at the bottom of the screen, use the parental controls setting, and disable the Kindle Store.