Restarting app problem with minecraft

Ok, so i downloaded an app that allows you to play on public servers for minecraft pe. It tells you to go to the main menu on minecraft, come back to it and chose a server, and then double click and go back to minecraft pe. I do all of this and then when I double click and go back to minecraft pe it restarts and shows mojang instead of staying on the main menu. It won't work if it's not on the main menu when you turn the app on. Somebody please help me do this. Thanks. :)