Post URL’s

Hey Guys I was just wondering about post URL’s! Every time i creat a new Blog post and publish it, the url bar shows something like this http://mysitename.com/?p=123 and when i create a new page the url shows something like this http;//mysitename.com/?page_id=5 how can i change them to show http;//mysitename.com/about on a new page and http;//mysitename.com/bloggingposttitle! would love to have that guys! Best Regards1
Phillip Dews