It is advised to set your phone to Airplane mode before you start, so you should not receive any phone call in middle of the process
1] Download the app to your phone
2] Click on the app to install it (It should be found in the File Manager / Download folder
3] Click on Install option
4] Click OPEN
5] Click on activate Device admin
6] The screen will go blank, press any key to open the screen
7] Turn OFF (grey) any switch which you want to block – THIS CAN NOT BE CHANGED LATER – BE CAREFUL!!
8] Restart you phone