message with led please help

Official Hardware Retired GSM Shield
1

I want to turned on RED LED if the message not sent and i want to turnes on GREEN LED if the message is sent

2

If you read about endSMS, you may use it to check whether an SMS was sended or not.

Returns int
In asynchronous mode, endSMS() returns 0 if it is still executing, 1 if successful, and >1 if there is an error. In synchronous mode, it returns 1 if the previous successfully executed, and 0 if it has not.

To lightup the LEDs :

digitalWrite(redLED, HIGH);
digitalWrite(greenLED, HIGH);

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Good luck