ShareThis-How to find icon images folder location?

I have ShareThis installed on my photoblog and I want to change icons color; I have been told to find ShareThis folder on my hosting File Manager, download the icon images, edit them and re-upload the amended files into the same original location.
I hope it is the correct way to do so but problem is the ShareThis folder doesn’t contain any icon images.
Another way to locate icon images I have been suggested to use, is to right click on one of them and select the proper command from the menu, but I don’t know which one to use
So how should I find them?
thanks