Thanks. Yes I entered a ssid name and a password in the arduino_secrets.h window.
The baud rate in the IDE is set to 9600 like in the sketch.
I tried again, but still no wifi created. The output is :
Attempting to connect to Network named: ssid_test
Attempting to connect to Network named: ssid_test
Attempting to connect to Network named: ssid_test
Attempting to connect to Network named: ssid_test