Access wired client via WiFi

I would like to connect to WiFi with a PC and be able to access a local client that is plugged into ethernet, using VNC. Is this possible? If so, what do I need to set up? I tried pinging the wired client from the wifi client, but it could not find a route.

Yes you can do that by allowing the WiFi network to reach the other network. Check out the firewall rules in LuCi.