solder the headers on, use the jumpers to connect the GPIO’s
(Don’t connect GPIO16, we’ll wire it to GPIO5 instead with a wire, directly)
Reference the kernelcon smartplug guide for flashing instructions:
http://hackspace.io/projects/projects-smartplugs/
Here are some additional screenshots
The below image shows using relay1 as GPIO16, we will not do that, please use GPIO5 instead!
https://usa.banggood.com/AC-or-DC-Power-Supply-ESP8266-WIFI-Four-way-Relay-Module-ESP-12F-Development-Board-Secondary-Development-p-1794113.html?cur_warehouse=CN
ESP12F_Relay_X4 (Manual)
esp-12F_relay_x4_relay board (notes)