The above poster is right. The "button" in question is a small light gray release about 3mm in diameter that is located under the QR on the battery clip.
Congrats on the new bike.
-SD
https://www.kickstarter.com/...bike-for-the-new-era
Congrats on the new bike.
-SD
https://www.kickstarter.com/...bike-for-the-new-era