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Larry, the designers of the forum software didn't make it easy.
Briefly, though, start a message, and as you enter your text, you'll notice a button underneath marked "Upload attachment." Click it, and it will open a form that reads, "If you wish to attach one or more files enter the details below." Click the small "choose file" button, and your computer will open a folder on your computer. Select an image file (.jpg or .gif) and click submit, and the name of the image will appear next to "choose file." Then fill in File comment with a caption (optional), and click the "add the file" button.
Once you've done that, click "Place inline" so the image will show in your message. The necessary code will pop in at the top of your post. You can select, copy, and move it to a different location if you want to.
Now, a gotcha: If the picture is bigger than 800 by 800 pixels, it won't work. And it will only work on desktop computers, not smartphones or tablets.
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Also, this is the method to upload a file from your own files. If you want to share a picture you find on the internet, there's a different system. Ask me about this if you want to know.
See, told ya it was a little complicated. But you can do it!
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