An email address is all you need. Signing up is the same step.
By logging in (which also creates your account) you agree to the Terms of Service and Privacy Policy.
Turn this off and nothing is kept once the rewrite returns. Anything already stored is deleted at the same time.
This deletes your email address, saved text, and settings. Any remaining coins are forfeited. This cannot be undone. Payment records are kept as required by law, with nothing identifying you.
To confirm, type the email address you registered with.