Would you mind to elaborate on this, it doesn’t quite make sense as it is

MODx
is a CMS (even a framework/CMF actually).
If I guess correctly the underlying question you’re asking is : How do I set up a portal with MODx ?
Well, if you’re looking on a pre-packaged portal system with one-click install, MODx might not be for you... You sure can set up a portal with MODx (entirely customized to your needs), by installing Modules such as
Forum,
Polls, a
Gallery, a
Calendar, File
Downloads and
Uploads, a
FAQ , a
News section, a
Blog or a
syndication page or any other features that are currently in MODx Modules, Plugins and Snippet repository.
The whole idea of MODx is having a light, extensible and flexible core application which you can tailor to fit your needs through installing Modules, Plugins and Snippets. But you won’t have a "all-in-one" and "one-click-install" application there (such as Joomla, e107, phpNuke and the likes...)... Power has its price