Download file from SD card to device using ESP8266

I’m making my way through the ESPAsyncWebServer sketch and downloading libraries, I’m stuck at the MYWIFI.h library. How does it work? The example I’ve found seems to be conflicting with the opening SSID and Password lines.
EDIT: Resolved by editing the SSID names so they match up between the MYWIFI.h library and opening lines of main sketch.