Blynk app download - https://play.google.com/store/apps/de...
Additional boards manager URL - https://arduino.esp8266.com/stable/pa...
Blynk library download - https://github.com/blynkkk/blynk-library
After you download the blynk library put it in the Arduino - libraries Then you have to follow this steps.
1. Go to file
2. Go to examples
3. Go to blynk
4. Go to boards wifi
5.Go to esp8266 standalone