As soon as the app is uploaded, the tip “Open“ will appear. Tap it.
Allow the app installation from unknown sources going to “Settings“ from a pop-up.
You need to switch the slider “allow for this source“ to activate it
Tap “Back“ after you switch the slider
Tap “Install“ in the window appeared
After you tap it, the installation will start
As soon as the app is installed, you will see the window with “Open“. Tap it.
The app is ready to use!