Arduino /Genuino Uno does not connect to the IDE

I installed the Arduino plugin within my web browser (Chrome) and select the Arduino /Genuino Uno. The name appears in the field, but with a red cross (see attached screenshot). Apparently it is not connected. What to do?

Screen Shot 2018-02-24 at 16.37.09.png

See that little down arrow what can you see when you click that.

If its a clone you are using you need to tell it both the board AND the port.

BTW did you say YES to the boxes that appeared during the CREATE setup ?
If you didnt then sorry its not going to work.

Thanks, that helps. It is indeed a clone, so where can I find the port?

In your picture there is a small down arrow in the BOARD box.
click that and it opens up so more options,.