The secret to attaching pictures directly to PLCTALK posts. without linking to external servers:
Use the button "Go advanced".
At the "Additional options", use the "Attach Files" button.
Important !! In the pop-up for choosing files to attach, notice the limits to Filesize, Width and Height. People typically miss that .jpeg can be max 800x600. So if you post a screenshot of your entire desktop, it will not show.
So, be sure that your pics are not too big, before you attach the files !
A peeve of mine is when people post huge pictures with the real information being just a small fraction of the picture. Please post only the relevant part. Use paint or some other program to crop the picture before posting it to the forum.