1. Log in as the user that created the report.  
  2. In Reports, open the saved Report.  
  3. Click File, Save As from the menu bar.  
  4. Mark the 'Others can modify this mailing' checkbox.  
  5. Click Save.  
OR
  1. In Reports, highlight the saved Report.  
  2. Right-click and select Save As to copy and rename the report.  
  3. Delete the old report.