Hiduino - Mega 2560 (as ISP) programming Uno r3

I'm trying to flash hiduino to an uno r3 using a Mega 2560 as an ISP.
I'm just wondering... in this tutrorial: Arduino Playground - MegaISP... it says connect an LED with resistor to pin 9 for hearbeat. I'm a bit confused as to A: where I connect the second LED leg and B: do I do that on the board I am programming Hiduino to (the UNo) or on the board that is doing the programming (the mega)

Thanks

okay i've worked it out myself and I thought i'd post it here in case anyone else needs to know one day.

The second leg of the LED goes to ground.

so that's pin 9 and ground. And it's on the board that is acting as the programmer. SO in my case the mega.

Thank you me :slight_smile: