The manual probably won't be much help. All the buttons are programmable and can be assigned any number of different functions. Who ever programmed the radio would have set it up a specific way. To know for sure, you either need to ask the person/shop that programmed it, or get the software and read the radio yourself.
The manual will cover the basics, but it won't do much to tell you which functions were programmed into that specific radio.
If you need the US version of that manual, let me know and I can get it for you.