Hi elk84,
Welcome to the MobileRead forum.
Try selecting 'PRS+ Settings' from the Main menu, then 'Menu Customizer'. It will give you the option to change one or more settings for what you want to appear as the 10 items on the Main menu. Choose one of the slots, containing an option you can do without, then 'Menu item'. The complete list of options is listed. Pick 'Audio'. Repeat with another slot for 'Pictures' then go back to the Main menu.
From there choose Settings - Advanced - Device Shutdown to reboot. When you switch on again the 'Audio' option (and/or 'Picture option) should appear on the Main menu in the slot(s) you customised.
As for default functions of all keys, I would think the User Guide pdf which came with the PRS505 might help.
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