Hi, this link shows how the 8x8 red LED array is assembled to a driver PCB.
If you look at the pic with the PCB completely disassembled you will see on the PCB screen which pin is number 1, the display plugs into the PCB the way it is placed next to it, with the part number and dimple to that side.
I have one of these arrays, I got it right by plugging it in the wrong way first, didn't damage anything because of diode junctions.
Hope it helps.
Tom...... 