Print message to all Players.

How can i make my Derma menu print a message to all players?

team_1.DoClick = function()
–Print(ply:Nick()…" Has joined the Blue team")
RunConsoleCommand( “team_1” )
frame:Close()
end

Loop all players and use:
http://maurits.tv/data/garrysmod/wiki/wiki.garrysmod.com/indexebff.html