How can I remove email addresses from my iPhone history?

[Promy]

I see all of these iPhone's online with pictures in the back of their menu's. Mine is just black and it's really plain can someone help me figure it out? When I set a picture to wallpaper it just goes to the screen when my iPhone is currently locked.. I want it on the home screen. What application do you download for that? Is there a free one? Help! Thanks.
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