Use paint for editing, go to image, strectch/skew and reduce the strecth horizontal and vertical. When you remove the 100% from the boxes type in the same number i both boxes. Say if you put 30 in both boxes the picture will be 30% the size of the original. It depends on how big the pic is when you start. So if its a 200kb pic, put 50 in both boxes, you should be around 100kb. I like to choose save as and name it #2 adn go to the properties and check the size. if its under 100kb great. I try to keep mine between 95kb and 100kb. If yo need help let me know.