This uses the 'Related Posts' module of the Jetpack plugin.
1) So first, go to Plugins > Add New and install Jetpack
2) If you don't have a WordPress.com account, you'll need to create a free one and connect Jetpack to it
3) Next, go to Jetpack > Settings - 'Engagement' and make sure the Related Posts tab is enabled.
4) Also click the down arrow next to the tab and ensure 'Use a large and visually striking layout' is ticked.
5) Finally, under the Appearance tab within Jetpack > Settings - ensure the Photon module is kept off - this interferes with Layerslider.