Here are ways to work with your list:
Enter or change information about an item. Type in a field or click in a field to display a pop-up menu.
Title: A descriptive name. If the to-do item originated in a note or message, you can click the arrow after the title to display the note or message.
Date Due: The date when the item must be completed.
Priority: The importance of the item.
Calendar: The iCal calendar where the item appears.
Alarm: If the item has a Due Date, how and when you want to be reminded of the pending item. For example, you can choose to be reminded by email message at noon two days before the due date.
Notes: Additional information about the item.
Mark an item as completed by clicking its checkbox. Mail indicates the date completed for you.
Sort your to-do list by clicking a column header. For example, to sort the list by priority click the Priority column header.
To change which columns are shown, Control-click any header and choose columns from the pop-up menu. A checkmark indicates the column is shown.
To change the order of columns in the list, drag a column header left or right.
To delete an item, select it in the list and then click Delete in the toolbar. The item is deleted from the calendar in iCal.