Actually, it's pretty easy. In the quick reply, which is what I'm using now, you'll see an icon, which has an image of a tree in it. Just click on that, a square will come up. Select "From Computer" Then click on chose file. Select the picture you want to upload. Click on "Open" Then click on "Upload File(s). Picture should appear in your thread.
P5210249 (2).jpg
The icon is in the second row, if you chose "Go Advanced" and when you start a new thread.