It is quite simple. You just need to upload a Word Document, PDF, or even a picture to the site. Once you have uploaded the document, you can share. Simply click "Share" and you will be given a unique link that you can share on your website, through an email, or IM. Once everyone has the link, it's time to collaborate! This could be a great way to work as partners or peer edit a document.
See how it works on "What to Do in Just a Few":