Search google images for whatever picture (or gif) that you want. When I'm looking specifically for gifs, I just type gif after whatever I'm searching.
You'll need to copy the direct URL for the pic (or gif), then go back to the TD reply page. Click the img button next to the top right of the reply box, and it'll prompt another window. Paste the direct URL for the pic (or gif) there and click ok. Hit Preview, below the reply box, to make sure your pic (or gif) works. If so, hit submit.
This post was edited on 7/23 at 10:31 am