Hi Bill and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
On your Kindle, go to Settings. In Settings, tap WiFi Networks. You will see your WiFi network in there. Tap and hold down your WiFi network and tap Forget or Forget Network. This will disconnect your WiFi from your Kindle. Now turn off your router and wait 2 minutes. Then turn it back on. Wait 2 minutes, go to Settings > WiFi Networks and connect to your WiFi network. Enter your WiFi password ***** asked.
Let me know if you have any difficulty connecting to your WiF.