Changing Picture of IPhone Icons?

Could someone please tell me how to change the icon pics on iPhone? I've googled/utubed this for days now. I've gone to the App Store and downloaded apps (cocoppa and app icons) that 'claim' they can do this, but I've had no luck. I do not want to 'jailbreak' my phone. Please help! Please provide detailed steps if you can help with this! Thanku in advance! Very

You could do it through Leo Privacy Guard. It offers you many advanced security features lik fingerprint lock and much more. You could also hide your personal images and videos so as to secure it from others.