basically you should use an excellent web compliant browser like GoogleChrome and go to your website. Hover over footer text that is bold and right click - choose "Inspect Element" and look at the results. It will show you on what line of which .css file that bold text is coming from. using either your cpanel or an ftp program go and fetch that .css file and remove the text-decoration style of Bold. Save the file and re-upload and this should do the trick.