The extraneous characters being printed in your UPS label are due to your browser settings. To remove the header and footer, go to the “File” menu of your browser (top left) and select “Page Setup”. In the “Header and Footer” tab, select “blank” in the drop down for all fields available.
Note: some browsers might have a different setting. Google for “Changing header and footer settings in <your browser name>” to find out more information.