To complete a subtask / shopping list item – just check the checkbox next to the text and it will be marked as done. If you have done it by mistake, simply find it among the “done” items, uncheck the checkbox and it will be marked as not done again.

An item you have decided to add to your main screen can either be checked as done from the main screen or directly on the main todo / event.

If you remember you have not done a thing, simply uncheck the item and it will come back to the “Activities/TODO” available for others to do.