Computer Question Please help me

It sounds like you need a VGA cable.

https://en.m.wikipedia.org/wiki/VGA_connector

My wife uses a laptop and I a desktop. We connected the laptop from my router with an ethernet cable, which is blue and perhaps 20 ft. long.

If this is the laptop you're talking about, then it has one VGA port and one HDMI port according to the same link (under the "Ports/slots" section).

While not quite sure what you mean by "I think its these 2 ports I need to link."; if you're talking about the VGA and HDMI ports on your laptop, then no, you don't need to "link" them together to use an external monitor on your laptop. If you mean use both the laptop screen and external monitor at the same time; then you might need to go into your operating system's display settings and enable the second display (the external monitor).

You can also buy VGA splitter cables to connect two VGA monitors to the same port on your laptop/desktop as well.

If you have anymore questions like this, it's best to lookup the specifications of your laptop/PC and check which display port's it has, along with the specifications for the monitor. That way you won't have to wait for someone on a forum to respond.

That's networking, and has nothing to do with the OP's question.

Hello thank you all for the replies I really appreciate it. I've ordered a VGa cable from Amazon which arrives tomorrow and hopefully this will do the trick. Thanks again.

The VGA cable arrived and it works perfectly thank you 👍🎉

You're welcome. Glad I could help.