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Once MemDeckPro has been launched, you may start training by either tapping Play on the tab bar or tapping anywhere on the image.
From any other page, i.e. Settings and Stacks, a double tap or a long tap on Play will start a training session.
The settings have the Aronson stack and Manual mode as defaults. It means that you will have to tap on the card's back or face for it to flip over.