How to change icon of installed app

Some might argue that it is impossible to change the icon of an installed app but after reading this tutorial you will discover that is very easy to change the icon of installed app. Here are the basic step you should follow.
Tools needed:
Blueftp
Steps to follow:
1. open your blueftp and browse to the directory of the location of the app
2. U will see a folder with the name of the app that end with _private e.g. Chess_private
3. Open the folder and u will see file with a name that end with .icn e.g. chess_icon.png.icn
4. Click menu and choose rename. Then copy the name of the file
5. Copy the picture u want to use as the icon of the app to a folder and rename the picture with the name of the file you copied.
6. Move the renamed picture to the folder where the file is i.e. Replace the file with the picture you have renamed.
If u followed the above step properly then the icon of your app will change to the picture u want.