You can't delete a constraint
By their nature, constraints are not deleted. A constraint is applied to every task. If you're thinking of deleting a constraint, what you probably want to do is change it from a date con straint such as Must Start On or Finish No Later Than to a flexible constraint such as As Soon As Possible.
Double-click the task to open the Task Information dialog box and then click the Advanced tab. In the Constraint Type box, click As Soon As Possible or As Late As Possible.
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What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.