Add images to the rotation like this:

1. Find/upload image on Imgur
2. Get the direct image link (Example: http://i.imgur.com/sZ9fANA.png)
3. Take the bold part and add it to the URL like this: http://img.twcclan.org/preview?sZ9fANA.png
4. Separate images with a comma: http://img.twcclan.org/preview?sZ9fANA.png,sZ9fANA.png
5. Add it to your signature like this [img]http://img.twcclan.org/?sZ9fANA.png,sZ9fANA.png[/img]
   (note how the preview was removed)

Preview: