From the Apple Menu click on System Preferences
Click the plus sign at the bottom left of the list
Choose VPN then L2TP from the drop down menus. Service name can be anything you'd like.
Enter in the detail provided by Fresh then press Authentication settings and enter in the User password and Shared Secret. Click OK then click Apply.
The VPN is now setup. You can click Connect to connect to the VPN. VPN is only needed when outside of the office.
Clicking the "Show VPN status in menu bar" will make the connection easily accessible form the top menu bar.