Press "+" button to create a new task.

Fill in the title, date, time, set a priority.
(Fields "Date" and "Time" can be empty. This allows you to create shopping lists etc.)

Colored circle shows a chosen priority.

Short tap on task to edit (not on a colored circle).
Long tap on task to delete (not on a colored circle).

Tap on a colored circle of task in "Current" to move task in "Done".
Tap on a colored circle of task in "Done" to move task in "Current".

Use "Search" to find the necessary task.

To return to the list of tasks from the "Help" menu, click the "Back" button on your device.