Please understand that our FSAStore and FSAStore Optical sites have separate accounts and are not linked. First, make sure you are not trying to log into one with an account made on the other. You can access either here:
To change the email address associated with your account please email firstname.lastname@example.org and wait for a representative to respond. If you have already done so and were suggested this article - a representative will respond shortly to help you solve this issue.
Alternatively, you can register the new email address you wish to use and order using these details instead, going forward.
We hope this has been helpful! Let us know if you have any other questions and thank you!
The Customer Service Team