Instructions to pin screen on Diamond devices

How to protect your privacy when lending a Diamond smartphone or tablet to someone else. Instructions for setting up "screen pinning" on a Diamond brand device. Block an application on the screen from which the user will not be able to exit without knowing the unlock pin, in this way you will prevent them from seeing your messages, photos and private data that you do not want to show.

Diamond D100 Plus Diamond D100 Plus
Diamond X3000 Diamond X3000
Diamond X4000 Diamond X4000