where I can find ground? there is AVR AVR ATmega32 and a board within. 
there is outputs for all ports (A, B, C, D) on board, and Vcc. 
the problem is - I have no external GND output.
to watch current - I should search for GND pin everytime. 
and now I need ground on my solderless board for LEDs and temperature sensor. 

let's guess that I have no idea what is current or electricity.
so the question is: where I can find ground to connect it to solderless board?
maybe I can use something else, except MCU? (like my hand or smth :D)
I've just sorted things out.
There is two interfaces - ISP and JTAG. ISP is busy with programmer everytime, but JTAG is free.
So, I have found pinout of JTAG interface and achieved GND.
There is pinout:

(source: digital-circuitry.com)