How do you message on blitz site?

HI
Im new and just requested a game.I find it difficult to find the chat ,i only found this chat through help

There is a little message box to the right, make sure you click on it before typing...just acquaint yourself with the surroundings once there, or you'll lose a ton of time lol...
Edit: There's no messaging available whilst waiting for a game in the 'lobby', it's only available in-game !