Complete demonstration of Yamaha PSR-S710 or 910 keyboard

Hi, My friend has bought a new Yamaha PSR-S710 keyboard and we would like to explore the whole keyboard as soon as possible. We tried all forums, but nothing helps. We just want to know how to make use of all the options in the keyboard and learn so that we can use it efficiently. Someone who has a same keyboard would be preferred (not required) and we can use web cam or a chat application during the demonstration process. Interested bidders respond as soon as possible. Thanks!