I just got a Galaxy S4 and love it but ... after watching many videos online about how to customize your lock screen I have run into a dead end. Everyone has a 'lock screen' tab located under my device (settings> my device > lock screen) which I do not have. On that page is wallpaper,LED indicator,motion,audio profiles,display and language and input. Im lost here and any help would be appreciated! Thank you in advance, Ryan.