Internet Explorer 8 or later:
- click on Tools and select Internet Options
- click Delete
- select Cookies and click Delete

Mozilla Firefox 10 or later:                                                                                         
- select History and click Clear Recent History      
- select the Everything option in the Time Range to Clear window
- select Cookies and Cache in Details and click Clear Now        
                              
Google Chrome:
- select More tools and click Clear browsing data
- select Cookies and other site and plugin data and Cached images and files
- select the Beginning of Time option to delete all content and click Clear browsing data

Safari 3 or later:
- select Safari and choose Preferences
- select Safety and click Show Cookies
- click Clear all and OK
- click Finish

iPhone / iPad:
- enter the Settings menu and select Safari
- touch Clear browsing data and cookies