From The Peopling of New York City

1. A very useful page about formatting wiki pages -- http://meta.wikimedia.org/wiki/Help:Wikitext

2. How to upload an image:
Click on "Upload file" in left navigation
Find the image file using the Brose tool.
Copy name of file -- i.e., image_example.jpg To make image show on the page, use brackets, like so: File:Image example.jpg

3. Free website for cropping and optimizing images: http://www.picnik.com/