If a quicksave data has been created, you will receive the message "A quicksave data has been found. Would you like to resume the game from this data?" when you tap on 'Start' at the title screen.

Tap on 'Yes' to resume your game from the quicksave data.

Tapping on 'No' will allow you to load the game from your normal save data. However, please note that loading a save data or starting the game with a different character will cause your quicksave data to be lost.