Prepare the header strip:
Cut the strip to length if necessary. It will be easier to solder if you insert it into a breadboard - long pins down
Add the FeatherWing:
Place the featherwing over the pins so that the short pins poke through the two rows of breakout pads
Be sure to solder all pins for reliable electrical contact.
(For tips on soldering, be sure to check out ourGuide to Excellent Soldering).
Start by soldering the first row of header