I had trouble working it out at first too.
Once you get the hang of the slider its pretty easy.
Also to browse by Artist/Playlist/Track/Album etc you scroll all the way to the top and select the very top button (which is blank I believe) and that takes you to the 'main' menu:
Once you're in a album or playlist etc, you can change track using the steering wheel controls. Same goes for watching movies from SD card, you can flick between the videos via steering wheel.
(Ignore the spelling mistake - Componsers...

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2004 Silver 3.0D Sport Auto - 20" Le Mans Rims, Gen 4 Hualingan DVD/BT/iPod/SD/Nav Headunit, E70 Rear Wiper Conversion, Front Bosch Aero Flatblades
