Depending on the browser you are using, you can very easily stop this information appearing in your printouts.
Internet Explorer:
Go to Print – Page Setup. Click each of the dropdown menu under ‘Headers’ and ‘Footers’ and choose ‘Empty’. Then click OK to save the settings.
Firefox:
Got Print – Page Setup and choose ‘Margins & Header/Footer’ tab. Click each of the dropdown menu under Headers&Footers option and choose ‘Empty’. Then click OK to save the settings.
Chrome:
Click Spanner icon and choose Print (Ctrl + P). Uncheck the option ‘Headers and Footer’ box.