I was originally having problems with this, so I decided to wipe it out and try again. Next time, I made more progress. (I think the first time I uploaded the file to the wrong directory). This time, I followed the directions to the word, very closely.
Now, this is happening: I can resize the image inside of the text editor, but when you save and view the thread, the image is still the original dimensions?
Any follow-up? I really need this hack to work.