Hi @colsen23153.
Did you read this from something on the Internet? If so, please provide a link to it in a reply here on this forum topic. That might provide important context that will allow the forum helpers to more effectively assist you.
The port is a software construct, not really a piece of hardware. However, it is likely it is accessed via a connection to the USB socket (marked "2" in the picture).
The operating system enumerates an arbitrary available port number for the device. It could be a different number on each person's computer. So your question doesn't make sense.
You can identify the port of the board by the following procedure:
- Disconnect the USB cable of the Arduino board from your computer.
- Select Tools > Port from the Arduino IDE menus.
- Take note of the ports (if any) listed in the menu.
- Close the Tools menu.
The ports list is only updated when the Tools menu is re-opened, so this step is essential. - Connect the Arduino board to your computer with a USB cable.
- Select Tools > Port from the Arduino IDE menus. - If a new port is listed in the menu, that is the port of your Arduino board.
Depending on the configuration of the Arduino board support for this hardware, you might also find that there is a helpful label in that menu on the port produced by the board, which makes it even easier to identify the port.
It probably doesn't matter.
Arduino IDE only uses the Tools > Programmer menu selection when you are performing an "Upload Using Programmer" operation, which is something only done in certain rare advanced use cases. In the more common use case where you are instead performing a standard "Upload" operation, the Tools > Programmer menu selection is completely ignored.