so, before entering you must create a shortcut of the exe and type space -log to bring up your network logbook u can say, with that u will be ask for the other Ip by the follow snippet here. the blue is where the Ip of the person trying to connect.

type the person Ip and join by ~ open (blank) aka the chosen Ip given to you!

Update: found a way that to join without this method, this is just how you would go about testing your own game per say: got to wire the join once you host button