Love It – New Wallpaper Pro : for iOS7 & Parallax ( Blur & Pattern Custom themes : by YoungGam.com ) Review

Great app!! However I have a quick question I have an iPhone 4 with the iOS 7 update and was wondering how do I change the wallpaper in the txt messenger to one that I customized from this app?
Review by Laura60632 on New Wallpaper Pro : for iOS7 & Parallax ( Blur & Pattern Custom themes : by YoungGam.com ).