I have connected my Mega2560 Arduino to my computer; locally everything works fine - I have been able to upload and run programs.
However, on Arduino Create, it shows that there's no connection to my board. I have downloaded the plugin. The instructions say to "choose a port", and in the image it displays a menu with "[board] at [port]" but in my menu there is no "at", it just says "Arduino/Genuino Mega or Mega 2560" with an option to choose a flavour, but no port.
How can I choose a port and get my Arduino connected?