Unfortunately, since Moo is a third-party service, you’ll need to contact their support team directly to reset your password.
Here are the ways to reach them:
Submit a support ticket: https://support.moo.com/hc/en-us/requests/new
Call their support team: +1 (401) 519-7216
Hours: Mon–Fri, 9 AM–7 PM EST (excluding public holidays)