using the multiple serial ports on mega

Hi, I'm trying to use the multiple serial ports on the arduino mega. I see there is some kind of code that makes use of this already here: but, when I attempt to use any Serial1 command I can an error that it was not declared. I just downloaded the latest arduino environment. How can I get this to work?

Also the documentation seems a little brief, I'm assuming Serial = the 1st serial port located on pins 0,1. Serial1 is the next serial port?

Have you selected "Arduino Mega" from the Tools > Board menu?

YES! Thank you, that was it. Can't believe I forgot that. Cheers!