There are two options for you to reset your password:
Option 1: Reset your password within ForeFlight Mobile. To do this, go to the MORE > ACCOUNTS. Tap on SIGN IN on the right side of the page (Near the bottom).
Image 1. MORE > ACCOUNTS > SIGN IN
On the next page, enter your account email address in the Email line. Once you have done that, tap on the FORGOT PASSWORD? button. A new temporary password will be emailed to the email address you entered.
Image 2. Enter Email address and select FORGOT PASSWORD?
OPTION 2: Reset your password using ForeFlight on the web. To do this, go to the ForeFlight Website. Enter your ForeFlight account email address and then click FORGOT YOUR PASSWORD. A new, temporary password will be sent to the email you provided.