This guide is assuming that you have already read the Getting Started for Maker UNO and installed the Arduino IDE. If not, you can refer it here.
1. Open the Arduino IDE and paste the following code into the sketch
2. Plug in the Maker UNO and upload the code.
3. Maker UNO remained plug in. Click on “serial monitor” on the top right of your Arduino IDE. Reset the Maker UNO and your should be able to see “Hello World”
4. Try to change 9600 baud rate to 11520 baud rate and see what happens.