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If you are using Windows, there will probably only be one option here and it will either say
COM3 or COM4. Even though there is only one option, you will still need to select it.
If you are using a Mac or Linux, there will be more options there, but it will usually be the top
option in the list, as this will be the device most recently plugged in. This is useful, as the
name of the port may not look like it has anything to do with Arduino. It will probably be
called something like /dev/tty.usbmodemXXXX or /dev/ttyUSBn