Virtual hard Disk. How to.
If you have already created a virtual disk using admin site or copied from somewhere else, you can choose the option "Use an existing virtual hard disk" and enter the full path of the disk file including file name with extension.
If you specify the Create new virtual hard disk option, it will create the hard disk file within the same path you specified for the Virtual Machine name. If you want the virtual hard disk to be stored in a different location, then you can specify the full path here.
All the above options will work. The first 2 will create a virtual disk file called DevServer1 in the location C:\VirtualMachines\ in your host computer. Last 2 options will create the disk file with the same name, but it will be stored in a location you specified for the Virtual Machine name.
Virtual network adapter
If you want to connect to network/internet from your virtual machine, make sure you select a network card from the drop down.
Now press the 'Create' button to create the virtual machine. This process may take few seconds to complete. You will be redirected to a page which shows the status of the new virtual machine you created.