To enter a start date for a task:

1. In the tasks list, select the task that you wish to enter a start date for.
2. In the task details on the right, click on the start field or add the start field using Add field. Alternatively, use the shortcut key w.
3. Enter the start date in the text box provided, or select an option in the dropdown.

For a full list of the ways you can enter start dates, see the formats for dates.