The manual is pretty clear... Which part don't you get?
You'll need an ”on room list" event, then you can get all the room information by expressions.
[quote:2ep8u8iu]ListRoomCount
After On room list, the number of rooms in the received list.
ListRoomName(index)
ListRoomPeerCount(index)
ListRoomMaxPeerCount(index)
ListRoomState(index)
After On room list, retrieve information for a room at an index in the received list. The state can be one of "available", "locked" or "full".
You can use a loop for loopindex from 0 to multiplayer.listroomcount to go through each room by index.
I really have no idea of what to do, I've tried this and it still is not working, here's an image of what I'm doing.
I don't know what I'm doing wrong I'm requesting the list and everything.