I am a Field Tester too (although I'm not currently a part of whatever test you are a part of). I had to opt out of a test over the summer. You need to contact them via the Field Testing website. On the left side of the page you will see a header that says "FITBIT FIELD TESTING" under that header just click "contact us". Send them an email. Also, I can't check now because I am not currently in a test, but I think there is an opt out link on your field testing page. They responded to me within a day. They are the best place to get help. While you are testing your are only supposed to respond to them for help because Fitbit Admins on here can't help with field testing. Good luck.
