If you have an XP/Vista computer that is already connected wirelessly to the wireless network, download the WirelessKeyView application. CLICK HERE
Download and save the zip file to your Desktop location. Once downloaded, please disable any antivirus, then go to your Desktop, right click and extract the zip to folder. Go into that folder. Now double click the WirelessKeyView (the second one, without the ? mark in the icon)
The first field Network Name is the SSID. The Key field is the security key.
Remember to Enable your virus protection after you have completed these steps and recovered your password.
To connect to Wi-Fi follow these simple steps:
A list of networks will appear. You may have to wait a moment as your Kindle detects networks in range. If your network doesn't appear tap the box next to Wireless Networking off and on to refresh the list.
Tip: Tap the 123!? key to enter numbers or symbols. Tap the ABC key to return to the regular keyboard. Tap the Shift key (up arrow) for uppercase letters.
Once you are connected to a Wi-Fi network, Kindle Fire automatically connects to it again whenever that network is in range. If more than one previously used network is in range, your Kindle Fire automatically connects to the network that was most recently used.