I forgot my WiFi password on my Kindle Fire. How do I find or replace the password?
Turn on your Fire. Put your finger at the top of the screen (where the time is) and drag it all the way down. Now at the top you will see a number of options. Select "Wireless". It will show you the Wi-Fi network you are connected to our those available. If you are connected, you don't need to do anything. If you aren't, you need to select the network and enter the network password. This is from my Kindle HDX but I'm pretty sure it is the same on the HD as well as on the regular Fire, as I have all three.
Of course, if you are talking about your parental control password, that's different. However, if it's the Wi-Fi password, this should do it.