Also, the PPTP VPN setup is somewhat hidden, you have to go to network / Remote User Access and click the checkbox to enable it, and only then will you see the UI for setting up PPTP or IPSec VPNs.
PPTP is no longer recommended due to associated security concerns, as a result Apple products no longer support PPTP. Setting up L2TP is the preferred method for remote user access (VPN). You can find the associated setup documentation in the following thread. I hope this helps.