Interfacing arduino uno with gsm moderm

Hallow can someone help me the pin connection for interfacing my arduino uno with
http://www.ebay.de/itm/New-SIMCOM-SIM900-GPRS-Quad-Band-GSM-Modul-Mini-Board-fuer-AVR-PIC-ARM-/320915579037

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The information for that module including how to command that module from the Arduino can be found in the zip file that is found in a link at the bottom of that page.

Thank you I saw the command.. another problem is that this module has no TXD,RXD and GRD pins like other GSM modems. i tried to use pin 2 of the serial port as RXD and I connected it to TX of my arduino likewise I used pin 3 and 5 of the module serial port and connect then to RX and GND of my arduino respectively. but the module is not seen by the micro-controller. Did I do something wrong?

have a look here : https://breadboardtronics.wordpress.com/category/sim900/