You have to use the "Reply" button. The "quick reply" does not support adding picts.
Go to the bottom of the" Reply" page after you post, and you will see "Attachments, and other Options"
Click on that, and a dialog box opens that says "Choose File".
If after posting a pict you get a page stating "Image file too large", you have to re-size it/them. You can right click on the image, and choose "edit". Paint will open, and allow you to scale down the image. Or you can D'load "Image Re-sizer" in windows "Power Toys".
Hope this helped...