D-Link EXO AX DIR-X1870 User Manual page 126

Section 5 - Quick VPN
Click Advanced settings. Enter your Passkey in the Key text box under Use
preshared key for authentication.
Click OK to close Advanced Properties and click OK to close Quick VPN
Properties.
Your Windows 8.1/8 system is now configured to connect to your Quick VPN
server.
D-Link DIR-X1870 User Manual 121