On the Log In page, click the link at the bottom titled Don't remember your password?
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After selecting this option, you will be prompted to enter in the email associated with your account. After entering your email, you will receive a message giving you the option to reset your password. If you don't receive the email, be sure to check your Junk or Spam folders.
*Note* You can also log into the website with Apple or Google IDs. In those cases, any password resets would need to happen through those companies, not through Imagine Products