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an account is a username, an email and a password. the username is the name your posts carry and the page they stand on at /@you, your posts stay yours to take down, and your hearts follow you to any device. google is the same account by another door.
without one you can still post — as a guest, signed anonymous.
this is your page —
post a patch
you are posting as a guest — the board signs it anonymous, and an anonymous post is nobody's to take down. make an account to post under your own name.
posting as — it lands on your page and stays yours to take down.
patches only — a post carries bricks, cables and knobs, never media files. every post is public; members can take their own down.