Start date — This field defines the start date of the task. You may type the date directly in the date field, or use the pop-up calendar to select a date. Click on the small button at the right of the field to bring up the calendar.
Due date — This field defines the due date of the task.
Priority — specifies the priority of the task.
Recurrence... — This button allows you to setup a recurrence for the task.
Modify the series... — This button allows you to modify settings of the series of the recurring task, instead of a single occurrence of the task.
Skip Occurrence — This button allows you to skip one occurrence of a recurring task.
Notify — Select this option to have the task remind you before its start time.