It's easy... Go to the picture right click open with paint
The on the top tool bar depending if you have the newer windows or the older style theirs an option for resizing.
On the older one it should be under photo properties.
On the newer windows 8 it should be right at the top were it says resize. I think the sites limit is like 2200x1800 pixels or something.
dude you could probably sell those on ebay... I'm sure lots of people would use them, me included. especially if you made different versions. I would put one on my 49cc and my 66cc and have people try to figure out why one is so much more powerful.