Yeah, I know it's annoying that it prompts you to complete the form before listening. That's a requirement that the individual stocks set, unfortunately.
But there is good news: most of the time you actually don't need to complete the form.
Just tap the 'Submit' button at the bottom of the form (without filling in the fields) and you'll often be able to start listening to the call. If it doesn't work, it'll tell you which fields you need to complete.