You have to root your phone in order to use root-only apps like the ad-blocker. Rooting voids your warranty and could, in rare circumstances, brick your phone. If you wish to root your device you should know what your doing and understand the risks. If you wish to root your phone I have links in my signature that will help you out. If, after reading, you have any questions about anything, feel free to ask as we will try to help you out.