I am using parental control on Kindle Fire Tablet, but I have forgotten the code.
Hi, Kristin, Here is some information I found for you.
You do not need to reset your fire tablet. Just go onto your amazon account and "manage your device" and deregister it. That resets the parental control password. Go to the device and hit resync. When thats done go into the settings gear, my account, and register it using your amazon account info.
By the way, Funamo offers more comprehensive parental control solution for Kindle Fire tablets. You can find more information including video tutorial on how to set it up at this link.