Whenever you click inside the VM Manager on 'Virtual machines', you will see the list of all instances (machines).
In order to work with an instance, click on the desired entry in the list (exactly as you did during the installation as described in section 27.5.2.1).
For example, you can increase or decrease the memory allocation (RAM), add new hard drives, integrate CDs and much more. In the following sections, we will discuss 'Status', 'Hardware', 'Options' and 'Monitor'.