It’s very popular and very easy to use. When installed and activated it adds a button to the top of the Dashboard Editor right beside the Add Media button.

When you position your cursor to the spot you want to insert the slideshow, click the button mentioned above, select or create your slideshow in the pop-up window that appears and you ok everything, you will see a shortcode in your post or page that looks like: metaslider id=341 with square brackets around it. That’s it.