To add a new source, select that option from the main options menu.
This takes you to step one of the process. On this page, click on the type of document you want to add to your working bibliography. Then click on the publication medium (digital, print, other). Then click the continue button at the top or bottom of this page.
Step two of the process is where you add citation information such as the author name, publisher, publish date, etc., along with any annotation you might want to include. When you are finished with this step, click the "Add Source Information" button at the bottom of the page.
From here, you'll be taken to a page that asks "Do You Want to Continue Working with This Source?" and your options, if the answer is yes, are to "Save Source Content (for example, by copying and pasting from a Web page or database entry)," "Evaluate this Source," "Add Another Source," or "Return to the Sources Main Page."