Ad Private Network -> L2TP
Server Host Name : usa1.vanishedvpn.com (or any other L2TP server from the list here)
Service Name : (one of your own choice)
Provider Type : L2TP/IPsec + pre-shared key
Pre-shared key : happiness
Username and password : copy and paste from the email you were sent when you joined
Group Name : (empty)
Tick/check "Save identity and password"