When you login into your website and have CM Admin permissions you will have a control bar at the top of the screen of pages you have permission to edit.
The CM Admin tab is full of pages and controls that you will be using to maintain your website.
Using the Modules tab you will be able to add modules to your webpages.
The Pages tab will allow you to add new page or update the settings of the page that you are currently on.
On the far Right is Mode which will show different view modes for the page you are currently on.
