To elaborate on the 08-10-18 post by robertp above, when you start a thread you can see the "Insert Image" button. If you are clicking "Reply To Thread", you have to scroll below "Quick Reply" and click on "Go Advanced" to be able to see the "Insert Image" button. Also, when you click on the "Insert Image" button, you must click on From Computer, you have to then click on "Basic Uploader" on the bottom right. Then you can click on the Browse button and choose your picture(s). Then click on Upload Files.
I hope its OK to post this test, if not I apologize in advance.