Download and install Cisco AnyConnect app via Chrome Web Store: https://chrome.google.com/webstore/detail/cisco-anyconnect/jacdijibdjifphcecdielmekkmfdpgee
Go to Chrome OS Settings and then click Add Cisco AnyConnect... button.
Click Add New Connection.
Enter the following settings:
Name: (any name would do)
Server Address: se-sto.ipdatafone.net
*you'll find the server list here.
Click Save Changes.
Go back to Chrome OS Settings and then click on VPN.
Click on Cisco AnyConnect (your VPN profile).
Enter your PrivateVPN registered email address for the Username.
Enter your VPN password.