Include the plugin on the page after jQuery reference.
<!DOCTYPE html>
<html>
<head>
<script src="jquery.min.js"></script>
<script src="dist/scripts/akno.jquery.min.js"></script>
<link rel="stylesheet" href="dist/styles/akno.min.css">
</head>
</html>
Then use the plugin.
$('#signupDialog').akno();
// ... somewhere later
$('#signupDialog').akno('close');