You can install Mambo on your account via the automatic script
installation system - Softaculous.
Here is the way of installing Mambo from Softaculous:
cPanel --> Softaculous --> Content Management --> Mambo --> New Installation
Mambo: A professional level yet easy to use Content Management System featuring inline WYSIWYG content editors, newsfeeds, syndicated news, banners, mailing users, links manager, statistics, content archiving, date based content, 20 languages, modules and components.
For more information on auto installing scripts, visit the Softaculous article.