Hi Mona,
If you are referring to the Project Summary Task (line 0) in the project
file, go to Tools> Options, View tab and uncheck Show project summary task.
If you have created a summary task by indenting subtasks, you'll want to
select the *subtasks* first and outdent them so they are no longer subtasks.
Then you can delete the summary task.
Hope this helps. Let us know how you get along.
Julie