Best way to do it is to host the image somewhere else. Flickr seems the most dependable. In Flickr, there is a way to share an image by clicking the right curved arrow to the lower right of the image and selecting "BBCode" and then selecting the size of image you want (800 x whatever is usually fine, 1028 x whatever is more than plenty) and then copy the resulting BBCode string in the long window and past it into your post. Then you end up with something like this:
Where's the driveway? by Jorn Ake, on Flickr
If you want to upload directly onto the forum's fairly limited storage, export a copy of the image somewhere easy to find on your computer, like your desktop, keeping the size reasonable (file size not image size.) Then click the image icon above the message composition window (third icon from the right) and choose "From Computer" and then "Select Files". Pick the file from your desktop and then "upload file". The file will upload and appear in the message. Like this:
weigle-1.jpg
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