Go to the Arduino website to download the software, look for “Download the Arduino IDE”. Make sure you download the correct version for your Operating System.
Run the installer and open the program. You have to go through the following steps the first time you use your Arduino:
- Connect the Arduino using a USB cable
- Select the correct Arduino in the software: Tools –> Board –> Arduino/Genuino Uno
- Select the correct port: Tools –> Port –> select the USB (Mac) or COM (PC) port
You might have to select the port again if you connect a different Arduino.