The fastest route to a fix is describing the scene of the accident. Include your browser, your operating system, your keyboard type, and the exact key or key sequence that failed. 'The E key doesn't register in Firefox on Windows, wireless board' gets action; 'testing is broken' gets questions. A screenshot works too, if that's easier to capture.
One hard rule: never paste passwords, payment details, or any other sensitive keystrokes into a message, even as an example. The tester runs entirely in your browser, so there's no reason we'd ever need that data — the same privacy-first thinking that shapes the tool shapes how we handle every contact message. The privacy policy page spells out exactly what we do and don't collect.
After your note arrives, a human takes over. We split reports into quick fixes and bigger projects, chase the tricky ones on our own machines, and fold strong ideas into future updates. No account, no ticket number, no technical jargon required — plain language from anywhere in the world is perfect.