?Help with joining friends via GUI

I've been working on this game for a couple of months and people have requested for a "Join Friends" function (When you usually play it joins a already existing server meaning when you play you always join a random server making it harder for friends to join each other) so I need some help on how to make a join/follow friends GUI. Also sorry if my wording isn't very good i'm not good at explaing things. My plans: Type in players name > Press join button > Join game via PlaceId