Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
What computer are you using ? Apple Mac or Windows PC ?
If using Windows, what version of Windows are you using ? XP, Vista,7,8 or 10 ?
Connect the Kindle to your computer with the USB cable and unlock the screen of your Kindle. Your computer will recognize the Kindle like an external USB drive, flash drive etc
If using Windows, open Computer or This PC. You will see Kindle drive under Removable media section.
( If using Apple Mac, you will find Kindle in Finder or desktop)
Open it and you will find Pictures folder. Copy your pictures in to this folder. Then disconnect the Kindle and you will see the pictures on the device.
If you have any difficulty on following the steps above, please let me know and I will walk you through it.