1- Is there more video tutorial than the 3 minutes one

Hi
1- Is there more video tutorial than the 3 minutes one to show what can be done with the plugin
2- When I type in CSS custom login ( like in the video)
body .login {
background: url('http://www.cbesprit.com/wp-content/uploads/2015/10/XL-Logo-CBE-Version-finale-RVB-e1446725121624.jpg') no-repeat fixed center ;
}
I get no result ...
Can you help