CHROME: the process can also be found with screenshots at: http://www.sleeplessmedia.com/blog/2012/03/how-to-clear-your-browser-cache-with-chrome/

  1. Towards the upper right hand side of the window find and select the Wrench Icon Button.
  2. Under the Wrench icon menu, select Tools and then select "Clear Browsing Data."
  3. Check the Empty the cache box.
  4. Press the "Clear Browsing Data" button at the bottom right of the pop-up window.
  5. Close the browser, re-open it and try to access the typing tutorials again.