Some resources to help you getting started with STM32 programming.
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Groups of channels for High voltage connection
Terminal 2-4 are similar to terminal 1, except that the control ports are D1-D3.
9V DC power supply connection
The function of the Terminal and the Jack is the same since they are internally connected, and you can choose either of them in needs.
IO controlling 4 on-board relays
D0-D3 4pins could be connected directly with Arduino pin number of 7-4, so that four relays could be easily controlled by the Arduino.
315/433MHz RF control interface
Together with pin of GND and 5V, they are the interface for 315/433MHz RF with encoder module to control the 4 relays remotely.
XBee form Socket for directly control by Xbee
The 4 relays can be directly controlled by the Xbee through the 4 DIO ports of Xbee.
I believe this is almost same as SeeedStudio shield, more details can be found at: http://seeedstudio.com/wiki/Relay_Shield_V1.0