How to read more than one message in a whatsapp notification?

If i have, let's say 3 whatsapp notifications, I only can read the first message of each one.

1. With the touch screen i only can: ignore, mark as readed, discard or came back to the notification widget.

2. With the buttons : jumo between different notifications.

How to read the complete conversation? 

Hope there's a way to do it and it's just i'm a bit clumsy

Thanks!