For now, you haven't saved anything yet.
Option 1 - You can get started by adding diigolet to your browser
Diigolet is a "super bookmarklet" that allows you to highlight and add sticky-notes, in addition to simple bookmarking.
Make sure the "Bookmarks Toolbar" is visible. If it is not, go to menu View > Toolbars.
Drag this button: Diigolet up to your Bookmarks Toolbar.