Arduino

BlynkSimpleEsp8266

Sketch > Include Library > Manage Libraries      [Wait for the download to finish]
In the "Filter your search" field, type "blynk". [Press Enter]
Click on "Blynk by Volodymyr Shymanskyy".
Click the "Install" button.                      [Wait for the installation to finish]
Click the "Close" button.

References

• Blynk Simple ESP8266 Header
• Arduino core for ESP8266
• Arduino IDE