Until I get the file upload tool running correctly, use the "Attachments" tab that is under the "Save Draft," "Preview" and "Submit" buttons to attach photos to your post. You need to be in the "Full Editor" view to attach photos.
I think there is a 1MB limit, so you will need to resize your images. That's not a bad thing, by the way.
Next year, I hope to move to a new server with unlimited server space, which will allow the forum posts to have unlimited attachments.