If you experience a problem playing with the app, have a suggestion for improvement or simply want to give us your opinion, you should send an email to KubiTarock support. You can do this as follows:
Press this button on the app bar of the game view to show the list of secondary commands. On a PC, you can use the menu of the title bar alternatively. This menu is more detailed than that of the app bar, so you can reach almost all the panes directly.