control led with arduino

i have arduino Mega 2560 and shield GSM efcom v1.2
and i want to control LED whith SMS
i traied a lot of code but they doesn't work

thanks for help

How have you got it set up? What code have you tried?

There's an example of using a similar shield with a Mega in my signature link. Put Jumper D0 on Rx and D1 on Tx.