Drag your screen so its width is below 768 pixels to test the mobile dropdown functionality.
You can set the breakpoint with an option. Read more about it in the README.
You can call the plugin on any element you like as long as it contains an anchor tag with an href attribute.
See the example button below:
Since a button like this doesn't require an offset (it's not fixed like the navigation bar) I set the navHeight option to '0'.