" If you originally purchased a Special Offers device, you will be charged a one-time payment to unsubscribe from this service, covering the difference between the device price with and without special offers. "
If your profile name is an indication you're in the UK, you need to go to that page on amazon.co.uk. (The provided link is for .com.) If you're outside the US or UK, you'll have to contact Customer Service to request the removal and to arrange for payment to unsubscribe. There's a 'Contact Us' button to Customer Service on the page linked, above.