Use the Edit Task dialog box to modify the type of task, its instructions, the end date and alert date, and email reminder messages.
Open the Manage Task Lists page.
See Managing Task Lists.
Modify the task name.
Select another task type. For a description of all available types, see Adding Tasks to Task Lists :
For Instructions, modify instructions for completing the task.
Optional: To enter an end date for the task, select End Date, and enter the date and time by which users must complete this task.
Optional: To send email messages if tasks are not completed by the end date, select End Date.
Optional: To send email messages after the alert date and until the end date, select Alert:
Optional: To make completion of this task depend on completing a primary task, select Dependency.