Enable appropriate setting in lobby options.
Post some chat message in 0ad svn lobby and change presence by /away and /back command f. e. or go into a game for testing playing presence and login with a second account into 0ad svn lobby to see that messages from player in chat are set to brightness of player with presence playing.
For testing new opened game info you will need two accounts, two see info in lobby chat.
Start a game with one account watch messages in other account for new game. Start game with bots slotted. End game. See end game message in other account.