How to change images to .png?
 

Take a standard ol' image, for example: http://www.vbulletin.com/forum/image.../forum_old.gif

Which is just a standard default forum status icon.

How do I change it to a .png? (I have one ready)

I tried searching for it in templates and only found two instances where it was brought up-- and it looks like those are for the legend and not the actual forum display.