modify the existing node.js application -- 2

Hi, I have a node.js express application. I need to modify one function. The source code is in here [login to view URL] We deployed the code into [login to view URL] I want to modify the create game logic. right now if you click play you will start the game and create the URL for the other player. you need to copy the url and send it to the other player. once they accept the request then you can start to play each other. I want to : See all the players list and setup a game match with the players. For example you can setup a game match on Monday 1PM with any player. Once they accept that match. you will have a appointment. You will see that match become available on Monday 1PM. I also need to modify some of the UI pages. Thanks, Gao