Using The internet/wan port to create lan network

Hello people

I am a complete noob with this, but I hope I can learn from this.
So I am trying to use my tp link router as a wireless network between my pc and my laptop. I saw that I have 1 ethernet port thats able to go to 1000mbps and the other 4 lan ports that go to 100mbps. Now I dont know but I hoped it was possible to get the 1000mbps port to work as a lan port so I can connect my pc and have faster speeds than the limiting 100mbps ports. How would I do this if thats possible.

Thanks for your time and for reading this
Greetings Ghostimo