i lost the paper with the number, how do i register my nutri bullet pro 900 for the warranty?

You need the serial number, which is physically on the blender itself.

1. Turn your NutriBullet Pro 900 power base upside down.
2. Look on the bottom. You'll find a sticker with the serial number printed on it.
3. Go to the website nutribullet.com/register.
4. Enter that serial number in the form to complete your product registration.

If that didn't work: If the serial number sticker is worn off or removed, the warranty may be voided. The warranty terms state it does not apply if the serial number has been removed or defaced.

Heads up: Failure to register doesn't take away your warranty rights, but registration makes any future claims much easier. Keep a picture of the serial number on your phone. The warranty is 1 year limited from your purchase date.