Section 11G here for the email address and opting out instructions:
"Opt out. You have a limited right to opt out of this Arbitration Agreement (excluding Section 11.I). Specifically, i If you are a new user of our Services, you can opt out of this Arbitration Agreement within 30 days after you first accept the Terms. If you are an existing user of our Services, you can opt out within 30 days after the effective date (listed above). To opt out, you must send a timely email to arbitrationoptout@etsy.com with your name, the email address for your account, your username and your shop name (if applicable), and a request to opt out of arbitration. If you validly opt out, neither Etsy nor you will be required to arbitrate as a result of this (or any prior version of the) Arbitration Agreement, but the Terms (and any other agreements between us) will otherwise apply to you. If we update the Terms after you validly opt out, we will continue to respect your opt-out, but such updates do not provide a new opportunity to opt out of arbitration."