wiring sim 900 to a adruino

can someone tell me how to wire a sim 900 to adruino uno ?

i should have bought a sim900a but bought a sim900
https://www.google.sr/search?q=sim900+arduino&tbm=isch&imgil=nNcTMPaKkT7pUM%3A%3BU0LiBwIyC5e54M%3Bhttps%253A%252F%252Fwww.pinterest.com%252Fpin%252F437975132495809997%252F&source=iu&pf=m&fir=nNcTMPaKkT7pUM%3A%2CU0LiBwIyC5e54M%2C_&usg=__8qQdPFqYj_tmNpxhmdyJQGUoFhc%3D&biw=1242&bih=579&ved=0ahUKEwiHvamv19LWAhWD5SYKHaAJB_kQyjcINQ&ei=upTSWYf4HIPLmwGgk5zIDw#imgrc=HUVopN6VjLsmzM:

If it's the one in the photo take a look at the link in my signature.

https://www.alibaba.com/product-detail/SIM900-SIM900A-GSM-GPRS-Development-board_60466834676.html
it is this one