Click "Add a VPN Connection" at the top. Here you have a set of options.
VPN Provider: Windows (built-in)
Connection Name: LSU
Server Name or Address: vpn.lsu.co.uk
VPN Type: L2TP/IPsec with Pre-shared Key
Pre-shared key: This was shared around in an email from Andy Todd on 10/01/2017. If you can't find this, contact the Tech Department.
Type of sign-in info: Username and password