The subject pretty much says it all. This is a recurring and recurring and recurring question all over the place on TH forums. It would be nice if we had a topic where we could direct users that gave step-by-step instructions on doing this.
A perfect example of why I asked why TH does not self-host images. And, yes, I know that ship has sailed. But this is an illustration of what happens, repeatedly, over time with external hosting.the images in the sticky itself are in the process of being updated due to tinypic removing access to them.