Can I disconnect the Wi-Fi and connect my box to the internet with an Ethernet cable?

Updated 

Yes, there is a dedicated Ethernet port in the box. You can connect to the internet through Wi-Fi or Ethernet cable.

Yes, there are different ways to connect your TV. Just follow these simple steps:

Remove the Wi-Fi dongle and connect the Ethernet cable.

Restart your box.

Press the Menu button on your remote control, select Settings and press OK.

Select System Setup and enter the PIN code and press OK.

Select Network Preference, press OK.

Choose Ethernet and press the blue button on your remote control to activate the changes.