3 to 32 characters. Letters, numbers, dots, hyphens and underscores.
Used only to reset your password. Without it, a forgotten password means losing access to everything you have stored.
At least 12 characters. Three or four unrelated words make a password that is both easier to remember and harder to break than a short jumble of symbols.

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We store your username, email address and a one-way hash of your password - never the password itself. See the privacy page for the detail.