Go to DHCP Table under Diagnostics and copy the IP ADDRESS


Go to NAT > Port Redirection > Choose a Port


Settings

Mode: Single

Service Name: Kiosk

Protocol: TCP

WAN Interface: ALL

Public Port: 5995

Private IP: Paste the IP ADDRESS from DHCP Table

Private Port: 5900


Open VNC and enter public IP address with 5995. i.e. x.x.x.x:5995

Password: secret