Click the Apple Logo and then select System Preferences.
Proceed to Network.
Click + to add a new VPN service profile.
Set the Interface to VPN. Select L2TP over IPSec for VPN Type. Enter any name on Service Name. Click Create.
Enter the following settings:
Server Address: se-sto.pvdata.host
*you'll find the server list here.
Account Name: (your PrivateVPN registered email)
Click on Authentication Settings...
Password: (your password)
Shared Secret: privatvpn
*without the 'e'.
Click OK.
Click Advanced...
Tick Send all traffic over VPN Connection. Click OK.
Click Apply and then click Connect.