To troubleshoot Wi-Fi connectivity on your NOOK Simple Touch:
1. Go to Settings, and tap on Wireless. Then tap on the button in the top right corner to turn off your Wi-Fi. Wait for a minute, and then turn on your Wi-Fi. This will refresh the wireless connectivity of your device.
2. If you are still experiencing problems, press and hold the power button for 5-7 seconds until a pop-up message appears, and tap on Power Off to completely turn off your NOOK Simple Touch. Wait for a minute or two, and press and hold the power button for 2 seconds to turn on your NOOK Simple Touch.
3. Go to www.nook.com/update to check for any software updates, and download the latest update for NOOK Simple Touch. It's easy; just follow the step-by-step instructions on that page.
4. If you're using your home Wi-Fi network, try resetting or powering off and powering back on your home Wi-Fi router. Also, try repositioning NOOK Simple Touch closer to your router for a better signal.