Chances are this is more of an issue with the website and the browser that you are using than a problem with the printer. For example, the first thing to know is if your printer is able to print from other websites or local documents. If the printer is working for other documents then the problem is with your site or browser. If the printer is not working at all then the first thing you should try is always uninstalling and reinstalling with the latest update from http://support.hp.com.
If you would like more suggestions or ideas then please respond with more details about this situation. Test printing from a few different areas and report back what consistencies or problems you can find along with any error messages that are displayed.