can anyone please tell me how to chat in multiplayer mode

Hi im Keith im 43 from minnesota and been playing fs since 2010 love fs 2013 play it everyday i enjoy getting away from the everyday life and if anyone can tell me how to chat with others playing this online i would apricate it very much

i try to playonline to help people out but i dont know how to chat with them when i join the game does anyone know how to doo this and would u please show me how ty