Eggtimer Rocketry Rev A4a Assembly And User's Manual page 17

Hold your soldering iron to the SIDE of one of the corner pads for about 5 seconds, then apply
solder to the TOP of the pad right next to the wire. You only need a little bit, you'll see it flow
out and drop down the hole when you got it right. Be careful not to get any solder on the metal
shield covering the top of the WiFi module. Repeat for the other three pads, then remove the
tape from the board.