Well assuming you have installed your system and it all works perfect, which I'm sure it does, this is a quick into to what the system does.

Pages and Links 

Firstly there are a few bits to realise, the pages and menu links are separate. You add the page, and then you add the link to the page. This means you can have some pages in your website that are not linked from the main menu. We will go through how to add a page and the links in the "Page Adding" section.

To access the pages section you simply go to the top menu in the admin pages and follow these links

Content > All Content Items

Then you can either click on the "New" button at the top right of the page or click on the page title you want to edit.

Components, Modules and Mambots

 are the bits that are added to the the system to make it work in a different way like a plugin does on your computer. You simply goto Installers and choose the type of plugin it is, which will open a page with a browse button. You now just find the Zip file on your computer (that you have usually downloaded from somewhere) and click "Upload and Install", simple as that.

There is more info at Installing  Extras