I am trying to open port for ps4 to be able to play minecraft since i have a nat type of 3. whenever i try to assign a static ip address it tells me that my wan cannot be on the same subnet as my LAN

hello, this is my first thread in the tp-link forum. so basically I am trying to play ps4 minecraft with my friend but the issue is that my nat type is nat type 3 and I am not sure how to do port forw