When you buy a pack from Adafruit, it comes with the fully tested
and assembled backpack as well as a 7-segment display in one of the
colors we provide (say, red, yellow, blue or green). You'll need to
solder the matrix onto the backpack but its an easy task.
Remove the parts from packaging and place the LED matrix OVER the silkscreen side. DO NOT PUT THE DISPLAY ON UPSIDE DOWN OR IT WONT WORK!! Check the image below to make sure the 'decimal point' dots are in the same location as the ones on the silkscreen.
That completes the basic assembly. For use on a breadboard, you will want to also install a 5-pin header on the edge of the board.
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