A very brief how-to:
1. Open a browser tab showing the image you want to display in your post (could be hosted on Flickr, the manufacturer site, etc).
2. Right click on the picture and select the option to Copy Image Address or Copy Link Location. This terminology varies depending on the browser used.
3. When you are typing your post here on the forum simply click on the picture frame icon

.
4. Paste the url you copied in step 2 between the two img tags that are now in your post.
That's it. Your image will appear like the one below:
