how do i add friends to the server query so i can join them

[mknudsen 0]

as stated not sure how to add friends so I can see what servers they are playing on.

[Steak and Potatoes 13480]

Just add them on steam and filter friends it will show them on the different servers.

[Kegaro 19]

I just click the friends tab at the top of the server screen. It will only list servers with your friends (Steam) on them. Then you can look at the details at the bottom to see which friend is actually on that server.