How does JS work on FORM? (HTML)

Question

when I create FORM, Input type submit with 2 value,
"Yes" and "No".

I want if someone clicking on one of the buttons, the ALERT BOX will appears.

(bad English?, sorry i'm still student on high school).

Answer 1

Here you go..

https://code.sololearn.com/WHF5KJRqAnv1/?ref=app

Answer 2

Like this:
https://code.sololearn.com/WODv0OV5mZWz/?ref=app