Go to your System Preferences:

Click the Network icon:

Click the + (plus) icon in the bottom left to add a new connection:

Select VPN for the Interface:

Select Cisco IPSec

Enter a label for the Service Name and click Create

Enter the Server Address from the list of IPSec names in the table below,
as well as your blackVPN username and password

Click the Advanced… button

Enter the Shared Secret: blackvpn
then click OK

Click the Connect button to start the VPN connection

Select IKEv2

Enter a label for the Service Name
and click Create

Enter a domain from the IKEv2 list below for the Server Address and Remote ID

Click on Authentication Settings

Enter your blackVPN username and password, then click OK

Click the Connect button to start the VPN connection

Country	IPSec IKEv1/L2TP/PPTP Domains	IPSec IKEv2 Domains
Australia:	australia.vpn.blackvpn.com	ike2.australia.blackvpn.com
Brazil:	brazil.vpn.blackvpn.com	ike2.brazil.blackvpn.com
Canada:	ca.vpn.blackvpn.com	ike2.ca.blackvpn.com
Czech Republic:	czech.vpn.blackvpn.com	ike2.czech.blackvpn.com
Estonia:	vpn.blackvpn.ee	ike2.blackvpn.ee
France:	vpn.blackvpn.fr	ike2.blackvpn.fr
Germany:	vpn.blackvpn.de	ike2.blackvpn.de
Japan:	japan.vpn.blackvpn.com	ike2.japan.blackvpn.com
Lithuania:	vpn.blackvpn.lt	ike2.blackvpn.lt
Luxembourg:	vpn.blackvpn.lu	ike2.blackvpn.lu
Netherlands:	vpn.blackvpn.nl	ike2.blackvpn.nl
Norway:	norway.vpn.blackvpn.com	ike2.norway.blackvpn.com
Romania:	vpn.blackvpn.ro	ike2.blackvpn.ro
Spain:	spain.vpn.blackvpn.com	ike2.spain.blackvpn.com
Switzerland:	vpn.blackvpn.ch	ike2.blackvpn.ch
Ukraine:	vpn.blackvpn.com.ua	ike2.blackvpn.com.ua
United Kingdom:	vpn.blackvpn.co.uk	ike2.blackvpn.co.uk
USA Central:	central.vpn.blackvpn.com	ike2.central.blackvpn.com
USA East:	eastcoast.vpn.blackvpn.com	ike2.eastcoast.blackvpn.com
USA West:	westcoast.vpn.blackvpn.com	ike2.westcoast.blackvpn.com