ACARS applications are usually airline specific programs, so there is not one single way to do it for every airline, rather quite the opposite.
For us it is on the mainscreen of the ACARS program, line select it, on the ground it is automatically pre-filled with the code of the departure airport and departure ATIS is selected, in flight it is automatically set to the destination airport and of course arrival ATIS. But of course we can switch to every other airport we like and select departure, enroute and arrival information.