RC522 not Being Detected by the Serial Monitor-PLZ Help

I followed a guide about writing NFCs using the Arduino and RC522 module, but after I assembled everything, clicked on the serial monitor, and tried to load the code into the module, nothing shows up about the RC522 in the serial monitor. It's a blank, empty space.

I'm using the Arduino Uno board and my operation system is macOS Catalina 10.15.4.

Any suggestions about how I can troubleshoot this? I'm certain that I connected everything the right way and the lights were lighting up as it should be.

Any help would be the most welcome. And here is the tutorial that I followed: - YouTube

My first language isn't English so please don't pick on my grammar issues. Thx.

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