you have 2 options.
1/ rca analogue out to 'tv' on your amp. you then convert the stereo signal to a surround option of your choice.
2/ hdmi out to 'tv' on your amp - this will only work if you have an hdmi equipped amp.
others may be able to clarify whether this option will carry picture & sound [i dont think it will carry the sound as you'd need to have an optical out or the like from say a sky box] so if you plan on using freeview from the set option 1 is your only choice really.
hope this helps