Go to Settings.
Under Network, click Add connection and then click Add built-in VPN…
Enter the following settings:
Service name: (any name would do)
Provider type: L2TP/IPsec
Server hostname: se-sto.pvdata.host
*you'll find the server list here.
Authentication type: Pre-shared key
Username: (your PrivateVPN registered email address)
Password: (your password)
Groupname: (leave it blank)
Pre-shared key: privatvpn
*without the 'e'.
Click Connect button.
Wait for a few seconds...