Try to restart the device by holding down the power button for 40 seconds until the device turns off, then turn it back on. Also make sure Wireless Connectivity is turned on in Settings.
If this doesn't work your tablet may be running outdated system software. Instructions on how to update the Fire HD 7 (4th Generation) can be found here.
If you are still having issues the problem may be with your actual WiFi. In this case check the internet connection of another device, if that device can't connect either try turning your router off and back on again.
We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.
Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!