Help pls room creating^^

hey hope here it is correct xD
i want create a room in multyplayer for pokemon us.
i can´t open a room, because i can´t pick the game and without it i can´t open a room… hope someone know what to do or how i find the box were i can pick it correctly.

what? what do you mean you can’t pick the game?

i can´t create a room it tells me all the time:
u must choose a preferred game to host a room.
if you do not any games in your list yet, add a game folber by clicking on the plus icon in the game list. but i can´t find it… so i don´t know what to do to host a room…

you can’t find the folder you keep your games in? what?