HOW TO INSTALL A LAUNCHER
CHANGING THE UI WITH a launcher is like installing any other app. After launching it will either bring some changes or completely change the homescreen and allow you to customise it according to your needs. The next time you press the home key, the phone will ask you to choose the launcher – the default or the one you have installed. In case you want the new launcher to be the default, select on the always key and not "just once".