I click the insert/edit image link, and apparently it only accepts images from the web, not your own PC, so I uploaded the image I wanted to my Google Drive, made it public, grabbed the link and pasted that into the "Image URL" field in the popup and hit OK, but then all that gets inserted is a broken image icon as shown.
You can see the image for yourself here at the link below and prove to yourself that there's no login issue or anything... so why can't I insert this into the body of the forum post?
https://drive.google.com/open?id=0B3MfvEtIvIvxYU8xNENDQ1hLckU&authuser=0
There are three tabs at the top. "Compose" "Options" "Preview"
Select "Options"
Then click the add/update button, and pick your image.
Now you can write your post as normal, and the image will be posted.
I've attached your image as an example, using those same steps.
-SteveZ
Cool, thanks.