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To change the file size or format, you'll need to open the image in your own editing software and save the image again in a smaller size or new format.
Each image editor behaves slightly differently, but the editing process will generally work like this:
Consult your software's documentation for complete instructions.
You don't need to buy any fancy software to edit your images. Most computers include a basic tool (try MS Paint or Microsoft Office Picture Manager on a Windows computer, or Photos on a Mac) that you can use to make simple changes to your images, but you'll also find some great resources online. We've had good luck resizing and reformatting our images with both web-based and downloadable image editors.
For basic editing, try one of the free tools we've listed below or search for your own.
Hint: If you plan to do more advanced image editing, such as making transparent backgrounds, you may want to consider purchasing professional software like Snagit or Adobe PhotoShop. Many manufacturers offer free trials of their software--be sure to try before you buy to see if a tool works for you.