Never mind that edit button, that's great for taking out mistakes, but does not mean your message has not been submitted. Don't click submit again, you'll only send it twice (and I've done that a few times). Just click back to question list.
YOU CAN PM SOMEONE BY CLICKING ON THEIR NAME. THIS TAKES YOU TO THEIR HOME SCREEN. THEIR WILL BE A BUTTON WITH PRIVATE MESSAGE...CLICK ON THIS AND IT WILL ALLOW YOU TO TYPE THEM A MESSAGE...GOOD LUCK