Did you follow this part of the instructions there:

Then you copy the file called includes/templates/template_default/template_info.php, and put it inside includes/templates/CUSTOM/. Next, open includes/templates/CUSTOM/template_info.php in your text editor. Change the information below between each set of single quotes to suit your new template. Remember to keep the single quotes. .......
and alter this (in red) to reflect your custom template name:

$template_name = 'Classic Contemporary Green';