Hello. My name is ***** ***** I can help you solve your problem. How do you know that your the software on your Kindle needs to be upgraded?
What is the model name of your Kindle? Is it a Kindle Fire, Paperwhite, Reader, etc.?
I have researched your issue and found that updates are required on most if not all models. The particular update will depend upon your model name, which you have not provided. The updates will be installed using a usb cable connecting your tablet to your computer. What is your computer operating system (pc or mac)? What version of Windows or OSX?