That post is pretty old... Now, in 2015, it is easy to click on UPLOAD A FILE, right there below the posting window, to the right of the POST REPLY button, and you can then point the file out on your local hard drive....orrrrr, you can now, in 2015, just literally drag a photo into a posting window and it like magic, will be attached!
The "old way" involved basically pasting in the URL, and also adding a couple of all-important bits of code/tags. But yeahhhhh, the old way of posting images, and the post associated with it, was...terrible.
Right now, I am going to literally drag and drop a screen cap, from my desktop, and into this posting window, right HERE, to this "X" and then BOOM< up pops this dialog,
offering me the option of thumbnail, or
full image:
Here, let me drag the screen capture of that stage right here to this "XXXX" location in this posting window!
XXXX
And there you go...that's how to do
the drag and drop method of uploading of image files to TPF!!!