Then you'll first need to ensure your laptop/desktop supports VNC first. This can be done by installing a VNC server software to the device.
e.g.
- VNCServer https://www.realvnc.com/en/connect/download/vnc/ for Windows; or
- krfb https://apps.kde.org/krfb/ for *nix-like OEes
(Not sure why you keep insisting special software is needed on the router, aside from setting up VPN. Feel free to elaborate/inquire if there's some remaining confusion.)