I have fixed the image upload.
Here are the image upload instructions (and I also fixed them in the Help area)
Uploading images is simple. Just click the button shown, browse to select your image from your computer, and click Open! The image will appear in your post.
Once you upload, if your image looks too big, double-click the image in the editor window and the Image Properties window wwill appear.
Just change the Width value to something smaller, and the Height will be figured out automatically. If it looks stretched out, click the circular Reset arrow shown in the image below and then click the padlock. That will lock in the original proportions, then you can proceed to alter the width and the height will follow.
Click OK to keep the change!