How do you play "Jingle Bell Rock" on flute?

Buy a piano/voice part online or at a store (an individual song is usually only about 3.95) and read the melody line. You may have to take it up an octave if it's too low. Jingle Bell Rock is a copyrighted song and is not likely to be found for free. I could give you the notes, but that would be a violation of copyright and I'm not willing to do that (maybe somebody else will).