Reference

Your tablet device cannot connect to a Wi-Fi network.

    Make sure the Wi-Fi function is turned on.
  • Tap [ Apps & Widgets] - [ Settings] - [Wi-Fi] in that order, and then slide the [Wi-Fi] switch to the [ON] position.

    Make sure there are no obstacles blocking the signal between devices, and the distance between devices is not too far [Details].
    A connection may be made available by changing the channel settings of your access point.
    Make sure the [Network SSID] and the [Security] of your access point are set correctly.