go to the first thread you posted above, then edit it. SEE Paperp and pencil icon on lower right of the thread you posted...
then do EXACTLY what I said, replace the letters url with the letters IMG and then save it.
you are reading too much into this, there are 2 ways to post;
in the thread itself (NOT quick reply), there is a place to upload one picture at a time, don't even look at the IMG buttons.
Upper right corner, Upload pictures, click, upload, save link and then come back to this page and click IMG, paste into white box that comes up, say okay.
Simply follow these steps, don't deviate, don't read into it, just do it.
Obviously you can post url links. JUST change the letters that say URL to IMG, don't touch anything else.