If you chose to have your To Do's appear on your calendar (the default), you can work with your To Do's directly from the calendar without having to change to the To Do view.
Click on the Calendar Bookmark. The Calendar will open.
Click on Day. The Calendar view will change to the current day.
If you have left the option to show To Do items on your calendar turned on, all of your current To Do items will appear at the beginning of the day.
Double-click on a To Do item in the list. The To Do item will open.
You can work with your To Do items from your calendar the same as you can from your To Do list.
Click the X on the To Do tab to close the To Do item. You will be returned to the Calendar view.