I dont know how to add one of the libs on my program

C:\Users\guilh\AppData\Local\Temp.arduinoIDE-unsaved2023613-7532-149m9kv.nplf\sketch_jul13a\sketch_jul13a.ino:7:10: fatal error: BlynkSimpleEsp8266.h: No such file or directory
7 | #include <BlynkSimpleEsp8266.h>
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

exit status 1

Compilation error: BlynkSimpleEsp8266.h: No such file or directory

What board type did you choose in the IDE when you compiled the sketch?

Pete.