If a user wants to get secure access to his router, you can activate a VPN feature to securely access the Wifi over the network. No user can access the Wifi without notifying an administrator. You need to enter the username, password, and pre-shared key that will be needed later while connecting to the VPN network from a different device. When you are done configuring the VPN settings click Save to apply the configurations you made. Any customization could be done later using the dlinkap.local window.