Install Library BlynkSimpleEsp8266.h in Arduino IDE

1. Open Arduino IDE
2. Click tab Sketch > Include Library > Manage Libraries… or
3. Search “Blynk”
4. Install “Blynk by Volodymyr Shymanskyy“
5. Click “Install”
6. DONE

sc : http://help.blynk.cc/en/articles/512105-how-to-install-blynk-library-for-arduino-ide