To install this app, download the APK installer from the Download section.
You can either navigate to your Download folder using a file browser app or simply begin the install by clicking on the completed download in your mobile browser.
Android will ask you to grant permission to either the file browser or your web browser to install the app. Grant the permission and it should bounce you back to the installation screen. If not, navigate back to your Download folder after granting the permission to try again.
If you have not enabled the Installation from Unknown Sources, navigate to your phone settings menu then to the security settings. Enable the Install from Unknown Sources option and try the previous step again.
The app should safely install.
I tried my best to design a simple and intuitive app, but anyway I made a short video most of the app features: