You can speak in game via hs,one of you must set a hearth secret,then you tell it through pm in forums,saying it in the thread isn't recommended as you will most likely get killed by a griefer.
Good luck with your settlement!

Oh and also you can add a friend on forums by clicking the name,then you will get to his profile page,there is an "add friend" button.You should look for a village tho
