Ronnie, if looking at the back of the set, with component inputs on the RHS towards the bottom of the screen, there are two black phono connectors at the top (on the same side). When you take off the rear cable cover there is a diagram specifying these.
These are audio (left and right) stereo inputs which automatically sync with your connection AV4. Pretty much anything can be set up as an AV4 input and you can synchronise your video source choice with a stereo feed (AV4) input. This is done automatically when you assign a source to AV4, don't worry about the technicalities.
Buy a torch, attach the leads, go into MENU-OPTIONS-CONNECTIONS, scroll down to AV4. For example, identify it as V.MEM (assuming you have a MK3 BEO4 remote) or V>AUX if that option is missing, choose YPbBr (can't be sure of all those letters!) for HDTV and you will be fine.