Structure for linking pages

Hey,

Would someone mind explaining the wordpress structure for linking pages to me.

I’ve setup wordpress in a folder called wordpress and uploaded it to my hosting. If I have main nav links called about, contact etc etc and I want the URL to be http://www.mywebsite.com/about etc etc. How can I do this? At the moment my URL would be http://www.mywebsite.com/wordpress/about which I think looks a bit rubbish!

Any advice on this would be great.
Shell.