I've set up my email with my iphone, but now i want to change my account.How do i do it?

i set up mail on my iphone, but used the wrong address. i want to change it, but don't know how. help please.
I've set up my email with my iphone, but now i want to change my account.How do i do it?
well what u do is ,u go to the this websit e.g www.iphone.02.co.uk depends on the network provider ur with the log into ur account
Reply:system preferences-


network settings