SIM808 v1.1 HardwareSerial SMS

Hi guys...

I need some help with this issue. I could connect the Sim808 module with arduino Mega. I can make telephone calls using AT commands. (I add this pic, if I can help anyone with it)

I using HardwareSerial 1 and I tried to send a SMS message using this information´s page:

But I don´t know how to write a code using hardwareSerial (or modify the right code), thanks.