Click on Action Center icon on lower right corner then at the bottom click on VPN
Click on Add a VPN Connection.".
Select and enter below settings to setup your L2TP VPN connection:
VPN provider - select Windows (built-in) option
Connection name - choose a name for this connection, for example VPNConnected L2TP
Server name or address - type VPNConnected server name you want to connect
VPN type - select Layer 2 Tunnelling Protocol with IPsec (L2TP/IPSEC)
Type of sign-in info - select User name and password
Enter your VPN username and password
Check Remember my sign-in info and on Save.
Click on newly created VPN connection VPNConnected L2TP and press Connect.
To disconnect click on Disconnect.