There are many different ways to crop and scale images. Below is a tutorial to download GIMP which is free software to do all sorts of image editing or you might like to just use a quick tool to reduce an image for the forum.
Here is an online tool for reducing images (do not to click the ads): http://www.picresize.com/
And here is an app for iphones and ipads : https://itunes.apple.com/us/app/image-size/id670766542?mt=8
Here is a tutorial on how to crop and scale an image in GIMP. GIMP is a free open source editing program that you can download to your computer. If you use another photo editor, the process is very similar. Some names may differ slightly.
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