Can't get the buttons to appear

I’m having trouble getting the sharing buttons to appear on my posts – or any page for that matter. I go through all the steps, make sure everything is marked correctly, click the save button, but no buttons show up. When I return to the sharing buttons settings it looks like all the things I checked and the icons I selected for sharing are no longer there. Help please!

https://wordpress.org/plugins/simple-share-buttons-adder/