Mike, It simply installed by choosing the "Add to Chrome" button (or it looks like a button) at the upper right side of the "overlay box" that comes up when I went to the web store.
It added a button, showing a carrot, on the main toolbar at the next to leftmost position. If one hits that button (or F7) the carrot button gets a very pale green background added to show that caret browsing is on and if one hits it (or F7) again it goes back to looking like a small carrot with a transparent background (the color of the toolbar shows through). I added this on my Win10 Home 64-bit machine running Chrome 48.0.2654.97 m. Brian
