Add Bookmarklet

If your bookmark bar is hidden press Ctrl(PC)/Cmd(Mac)+Shift+B to show it.

To begin using just drag the bookmarklet to your bookmark bar.

Go to a website

When you have the bookmarklet you can go to a website and activate the bookmarklet. Then the bar will open up and you are ready.

Highlight some text

When you have the bar open you can start highlighting text and when you are done you can save the cast and share the link or save it for later use.