Hello there Daniela,
Hope you're doing well.
You should be able to achieve that using JavaScript. Please consider the following code:
document.addEventListener('keypress', function enterPress(e){
if(e.which == 13) {
$actions.YourScreenAction();
}
});
where YourScreenAction is the screen action that you want to execute when you press "enter".
You should put this JavaScript in your OnReady event.
Hope that this helps you!
Kind regards,
Rui Barradas