Add the Spot-It! button to your website
Right click on the "Spot-It!" button and choose "Add to Favorites…" then add to your Personal bar

Note: Make sure your Personal bar is visible. Right-click on your browser toolbar and select the Menu Bar option to display it. In addition, you may have to enable pop-ups for the bookmarklet to work properly.
Then begin using the bookmarklet from your toolbar to add content to Jamespot.