recently I wanted to test the multiplayer of my game, the problem is that we do not find it together while the port and the ip are the same, so I went to see the server and it shows me this has the end :
It appears that UPnP Failed. Your might need to enable UPnP on your router or manually port forward to allow connections to your server.
I am a beginner and I do not know UPnP, nor how to activate it can someone explain to me?