Invoke the Arduino IDE, either through the Applications folder or by using Spotlight.
From the Tools menu in the Arduino IDE, select Serial Port and then select the port that begins with /dev/cu.usbmodem or /dev/tty.usbmodem. They will probably also say Arduino/Genuino Uno following the port name. Both of these ports refer to your Arduino board, and it makes no difference which one you select.
Figure 3-2 shows the list of ports.
You’re almost done! The final thing you should check is that Arduino is configured for the type of board you’re using.
From the Tools menu in the Arduino IDE, select Board, and then select Arduino Uno. If you have a different board, you’ll need to select that board type (the name of the board is printed next to the Arduino symbol).
Congratulations! Your Arduino software is installed, configured, and ready to use.
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