How to wire GPRS Shield

Hello

I have the ICOMSAT v1.1 GSM shield made for Arduino Uno. I want to wire it to work with Arduino Pro Mini.
How do I power it? Because if i give it 12 V where Uno's Vin pin woould be, it doesn't start. Also, do I need to press the button every time in order to start up the SIM900?

Thanks!