Ok, THAT's the best use of Legos I've seen in a while
if you turn the kk2 board over, it should have lables for each channel -- aileron, elevator, throttle, rudder, aux, for the header to the left of the screen (the right on the back). The pins on the right of the screen are for M1-8 from top to bottom.
You'll need to look up for your reciever whihc order is which for the channels, but it's likely the same mapping (I think they use the AETR order, but not sure). if you can't find it, hook them up, with the light colored wire going next to the screen and next to the lable on the RX, then after you power it all up, you can correct the order in the kk2's Reciever test (move the stick -- nope that's not the right response. move plug A to position B).
BTW, you board is mounted backwards -- buttons should be facing the tail.
the ESC from the front left goes to M1, front right to M2, rear to M3 and servo to M4 -- light colored wire goes next to the screen.
turn on your TX, Plug it all in (making sure polarity is right -- don't want to fry the ESCs) and the board should power up.