>>>You need to set the TV so that it's viewing via the HDMI socket (not via SCART or aerial)
That only applies if you're feeding a signal from an
external device, such as Freeview HD set-top box, a Sky HD box or a Blu-Ray player. If so, you only need to check that the cable from the device is feeding into an HDMI socket (which looks like this
http://bt.custhelp.com/rnt/rnw/img/enduser/vision_hdmi_socket.jpg ) and not a Scart socket (which looks like this
http://www.cvpoxford.co.uk/img/SCART.socket.png ). Then, as long as you're actually seeing a picture, you must be using the correct setting.
If you're not feeding a signal from an external device, the information you quote is completely irrelevant.