On the Log In page, click the link at the bottom titled Don't remember your password?
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