The smallest Wifi smartphone controlled 4WD car using ESP8266, Blynk and Arduino Code

Hi sir your project of the smallest car is superb and I also wanted to build something like you.
I am really amazed with your work.
I am studying your project and collecting all the parts as mentioned in your tutorial on YouTube.
Here I have one doubt regarding mosfet as there are three pins on it. Which pin is going to led and other connection as I have previously mentioned that I am not an engineer but an enthusiast.
Can you please provide me details of circuit.
It will be very helpful of you.
I have previously built one Wi-Fi car as well by following tutorials on YouTube.
Please provide me details of circuit.
Thanks again for such a good idea.