If you want a task to end on a particular day, set a finish date for the task.
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Right-click a task, click Information > Advanced tab.
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Next to Constraint type, click Must Finish On.
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Next to Constraint date, fill in your end date.
Tip: To set the finish date back to its original setting, change the Constraint type to As Soon As Possible.
Set a deadline for a task
Keep in mind that setting the finish date can lock up your schedule in ways you don’t want. If you just need a reminder, use the Deadlinebox instead. That will create an arrow on the Gantt chart 
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Right-click a task, click Information > Advanced tab.
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Next to Deadline,fill in your deadline date.
Learn other ways to control the dates in your schedule.
