Solder three wires to the NeoPixel strip as follows:
- NeoPixel - to Feather G
- NeoPixel DIN to Feather 13
- NeoPixel + to Feather BAT
We're soldering to the BAT pin because this is a 3v logic board, but the NeoPixels prefer a bit more voltage than that. This pin will take voltage directly from the battery without level-shifting -- meaning your pixels will be a bit brighter.