Hello, I am pleased to have the opportunity to assist you. My name is ***** ***** I can help you solve your problem.
First, you must swipe down from the top of your Kindle Fire HD screen to open the Quick Settings menu. Then select Wireless and look for your wireless network name (SSID). Select your network name and, if it is a protected network, provide your wireless password (Network Security Key) to connect your Kindle Fire HD tablet to your wifi.
Please let me know when you have done this and are ready to register your Kindle Fire HD.