Any help appreciated.

I see the [/img] button right after the
- button.
Insert image:[img]http://image-url/[img] (alt+p)
The above text doesn't tell me how to get the file dialog to upload an image? How do I insert an image?
I tried drag and drop.
/Users/davidavicks/Pictures/Korg M1 and Stand Alone M1 Le.png
Thanks again.
Dave