To play online poker with your friends, you have to firstly, choose the same site in the browser or app on the mobile. Secondly, by creating a Private Room that only you and your friends know the private information of the room. And lastly, you invite your friends into the private room that you've you created or they invite you to the private room that they've created. You and your friends can also join manually into the private room if you guys know the private information (room name and password) of the room.