The password is just used to access your Filmzie Watch List and to add movies/shows to the Watch List. (that little heart icon is how you add and remove them to the Watch List on Roku devices).
I just installed on Android phone to see how it syncs. On the mobile version, you select "Watch Later" and it will be added to this Watch List. By logging into your profile (using the password), you can universally view the Watch List, add/remove content from Watchlist.
Now that you have a Filmzie account using your Roku account email, go to the Filmzie website, enter this Roku account email, then select "Forgot password". You will be sent the link to change password. Then re-launch the Fimlzie channel/app on the Roku device and login using the new password.
Because you now have multiple Filmzie accounts going, just set both passwords to the same new password. After you get it working, delete one of your accounts if you wish.
I justran through the above process and the reset password is working. I had no problem syncing the Filmzie mobile app with the Roku and vice-versa.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
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