1. the image must be already anywhere on the web
2. right-click the image: copy image address
3. this window: top bar, 6th icon from the left, IMAGE, click it
4. a window opens, waiting for you to paste the Image's URL (it's address on the internet). Paste the Image Address in that URL box
5. width: enter 600 (the height will be automatically entered)
6. click OK