The first time you log into your VM you will see this screen: Â
(If you clicked cancel already simply go to the start menu then right click Computer -> Properties and scroll to the bottom -> Change Product Key)

Simply click activate now.
You will then be brought to this screen. Â Click Activate Windows Online Now:

Once complete you will see:

If you server needs to be licensed after 180 days simply open a ticket with technical support. Â We can help with this.