Ugh! Don't you hate it when that happens? Don't worry, we've got you covered! You can reset it right in the app.
From the login page: Tap "Forgot Password." Enter your email address associated with your Arro account. A reset password link will be emailed to the inbox associated with your Arro account.
Type in your new password and select Submit. You'll now be able to log in to your Arro account with your password.