Hackaday.io build instructions :- https://hackaday.io/project/9384-esp8266-blynk-5-servo-robot-arm
What is "Blynk" .... It is a Smart Phone APP that uses either Android or iOS to IoT your projects for remote control.
To get things started download the Blynk app off Google Play or Apple itunes.
Name your project and on the Hardware Model choose ESP8266 (there are many other selections including Arduino,Raspberry pi, etc)
It will create an "Auth Token" which its best to straight away email to your self as you need to paste this into your ESP8266 code later.