IMP,
Congratulations, and my apologies... I was lead to believe the instructions would be packaged with the speakers - seems logical to me too.
Anyway, here is the information you need.

The capacitor's value has been set at the factory. It is only externally mounted for those gear heads that like to try different brand capacitors of the same value.
The resistor, on the other hand, is designed to set how loud the tweeter plays. Changing resistor values will change the loudness of the tweeter. The higher the value, the quieter the tweeter will play - the lower the value the louder it will play. To play the tweeter as loud as possible, use a piece of wire instead of a resistor.
Most customers have left the stock values in place which would indicate they have pretty typical rooms.
Steve