You can use lucky patcher in non rooted devices easily.
First of all download latest version of Lucky patcher from: http://lucky-patcher.org/
Though this app has many more feature for rooted android, non-rooted android users can only enjoy following features:
1) Create modified.apk
This feature allows you to modify app. You can create app with custom patch applied (if available), app with ads removed and app with changed permissions and activities and the app will be stored in sd card. Then you have to install this modified app, before this make sure you have checked unknown sources in your device’s setting.
2) Backup App.
You can backup app only(means no data as like in Titanium backup)
3) In app purchases.
Wish everyone happy and enjoy the exciting features on của phone!