How do i ask out this girl ?

Hi , I love this girl Autumn . i am Jake. autumn seats next ot me in homeroom and her locker is next to my locker. She likes me and She knows that i like her alot . i knew her for a few months now. I have a very good friend chris of mine. how should i ask autumn out ? i know the friends of autumn too. i really love her and everything so help me thanks .