How can I change my account email?

For your Standard Notes Sync account

Email addresses for your notes account cannot be changed. Instead, you should create a new account with the desired email and import over your existing data. Then, if you wish to delete your old account, follow these instructions.

For your Standard Notes Extended account

Sign in to your Extended dashboard by entering your current email in the right-hand column and pressing enter. You will receive a login link in your inbox. Upon clicking that link and accessing your dashboard, you should see an option called "Change Email" in the "Subscription Status" section.