The stick will run on both wifi and ethernet. The wifi setup screen should show as a default when you go thru the intro screens. otherwise go to SETTINGS - WIFI.
In order to use ethernet you will need an usb-ethernet-hub for your stick. Place the usb-ethernet-hub in the usb port in the stick. Place the remote dongle in the usb-ethernet-hub along with your ethernet cable. Thats it.
Buy a USB-hub online: