How to solve screen overlay problem

HOW TO SOLVE SCREEN OVERLAY PROBLEMS

Many of us today have been wondering how to solve the screen overlay problem this issue started when they started developing the latest Android phones ranging from android 6.0 to 7.0. before you can access any app in your device you must at least give access to it, when an app draw over other app making it to show the screen overlay like this picture below.

many of us want to solve this issue but you cant, even when it shows open settings. 

but in this page i will be showing you how to solve, it all you have to do is to download an app called "INSTALL BUTTON UNLOCKER" from the google playstore.

"The install button unlocker image"

or if u choose to watch how to use it this is the link for the video  https://youtu.be/Fb6dCW51Wfc