If you need help to connect your Fire TV to the internet, you can watch the following video or read the instructions reported:
Detailed steps to follow:
1. Select Settings > Network from the Fire TV menu. Your device automatically detects nearby networks (that broadcast their network name).
2. Select your preferred network. If you don’t see your preferred network, it might be hidden—try selecting the Join Other Network or Rescan options at the bottom of the list.
3. Enter the network password, if needed. Some networks are open for everyone to join, while others require a password to connect.
You'll see a confirmation message on-screen when your device is connected to your selected network.
Note: If you're switching from a wired connection to a Wi-Fi connection, first make sure to disconnect the Ethernet cable from your Fire TV before trying to connect your device to Wi-Fi.
To connect to a wired network via an Ethernet cable (not included):
Connect one end of the Ethernet cable to the back of your Fire TV, and then connect the other end to an available Ethernet port on your router or modem.
Select Settings > Network from the Fire TV menu.
Select the Wired option. You'll see a confirmation message on-screen when the connection is complete.