If you're asking about removing Special Offers, go to your Content & Devices on the Amazon website, choose the Devices tab, select your Kindle and unsubscribe it. There is a charge to remove the special offers--either $15 or $20.
"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."
The above instructions are only applicable to residents of the US. If you live outside the US, contact Customer Service via the 'Help > Need More Help > Contact Us' link at the bottom of this forum...or any amazon.com page.