You also upload a photo to photobucket and then copy the image code and paste it direct.
The forum has a pretty strict file size limit. I've tried posting PDF's, but I can never get the file size under the limit no matter how much I cut out and compact.
So if you get an error, try checking the size of the photo.
You might have better luck uploading to a photo storage site like photobucket, and then creating a link to that photo. But I think any photos uploaded to photobucket are accessible to anyone, so don't upload personal stuff to that site.
Steve
Look for the "Manage Attachments" button below the box into which you type your comments.