Could not find AirGradient under File, Example

I flashed the esp8266 with Example, Blink.
Then I installed Arigradient Library by following the below step.
Go to Tools, Manage Libraries, and then search for AirGradient and install the AirGradient library.
However, to follow the below step, I could not AirGradient or PM OLED code under File, Example.

  • Once it is installed, go to File, Example, AirGradient and select the PM OLED code

Could someone please help?