Drag the button above to you browser's bookmark bar.
Firefox users: Make sure that the "Bookmarks Toolbar" is visible at the top of your browser. Click "View / Toolbars" and make sure that the "Bookmarks Toolbar" is checked.
Chrome users: Press <cntl>B to toggle the "Bookmarks Toolbar" on and off.
The fun will start, once you know how to collect images you like from websites far and wide.