Enter the world of digital annotation.
Go now to the hypothes.is web site, and follow the path for getting started. Here, we can help (link will open in a new window so you will not lose your place here):
All you will need to do is choose a username (maybe your twitter handle is a good choice?), create a password, and provide an email address. Just make sure you remember or jot down your user name.
You can do this later, but for the very curious you can follow step two for adding the tools to your browser. When you are done reload this web page to activate the annotation tools and start annotating.