Diigo Chrome extension is very easy to use.
1. If you are not signed-in to diigo, clicking the diigo button will bring you to a sign-in page. Even if you don't have a diigo account, you can sign-in with other accounts.
2. After you sign-in to diigo, clicking the diigo button will popup a bookmark window.
3. Diigo not only saves the URL, title, tags, it also gets the copy of the page.
4. You can conduct full text search for all your bookmarks.