To edit a task, perform the following steps:
Click the Tasks button from the calendar toolbar.
A list of all the tasks are displayed with a minimal set of attributes.
Click on the title of the task.
If your task does not appear on the list, you can search your tasks by typing the search attributes in the search text field. To know more about how to Search Tasks, see How Do I Search for a Task from My Calendar?
The task is opened in a new tab in edit mode.
Edit the required attributes of the task.
Click Save button from the calendar menu toolbar.