How to setup InternetCall App on Asus Zenfone ZE551ML

[AC Question]

I would like to use Android App "InternetCall" from Red Dye No.2 on my ZE551ML. How to set up the App as pressing the lower right part of the screen does not open the setup window

 

[B. Diddy]

Welcome to Android Central! If you can't get a good answer here, make sure you email the developer: internet.call.contact@gmail.com