Bookmarklet miss understanding

I didn't understand... where i put this line?
javascript:var%20e=document.createElement('script');e.setAttribute('src','//rawgithub.com/browserstate/ajaxify/master/ajaxify-bookmarklet-helper.js');document.body.appendChild(e);void(0);

Thank you :)

[hubdotcom]

You simply create a link with this as the URL (https://support.mozilla.org/en-US/kb/bookmarklets-perform-common-web-page-tasks)