Using GSM Shield for arduino uno

[andihong]

hello, i have an arduino uno and gsm shield

here my gsm shield
https://wiki.iteadstudio.com/SIM900/SIM900A_GSM/GPRS_Minimum_System_Module

i want to connect the gsm shield and arduino uno, but i just give the power to gsm shield, vcc and - .

there is UART data input and output, is there any port we must connect to them from arduino uno ?



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by the way, i am using library https://github.com/itead/ITEADLIB_Arduino_SIMCom


thank you.