So ...

Basically, the plugin adds a "Fixed Widget" option in all of your widgets.

Upon activation, go to Appearance => Widgets and expand the option panel on the widget that you want to make sticky.

All you have to do is to check the "Fixed widget" option:

And that's all ... Once you have saved your changes, you can visit your site to see the plugin in action. Your fixed widget will now be a sticky floating widget as you scroll the page up or down.

Here's an example:

OK. Now let's see some closing thoughts ...