title: How to edit stored value in NSUserDefaults
body: <p>I am storing some string value in NSUserDefaults,</p>
  
  <p>In the next button click I need to edit stored value and save new string in the place of old string.</p>
  
  <p>How can I do this.</p>
  
  <p>Can any one please help me.</p>
  
  <p>Thank you in advance. </p>