Ok, it appears that you are able to upload your image with no problem.
One you upload your image go ahead and select the description, not the image itself. If you do that correctly you should see this:
You need to select "Get the HTML code"
Next you locate the BB code and highlight the area you see in red in the pic below. Next you need to copy the area you just highlighted.
After you copy that area in red, you then go to the "Insert Image" link shown in the posts above that I posted earlier and paste the code into that link.
If you did it properly you should then see you pic automatically appear in the post after you finalize everything by selecting "Post Reply".