how to connect arduino uno to gsm shield

hello, i have an arduino uno and gsm shield

here my gsm shield

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 ?

by the way, i am using library

thank you.

Connect your gsm module to the arduino .

RX of the arduino to tx of the gsm module
tx of the arduino to the rx of the gsm module
and connect gnd or arduino to gnd of gsm ..

this is the only possible connection and now insert sim and power up the module .

program you can fnd in this link