No. They tap their link and answer in a browser. No app, no account, no password — and nothing to type, not even their name.
So their answer lands against their name without anyone typing anything, and so you never have to work out whether "Sara" and "Sarah" are the same person. It also means a link is personal: whoever holds it can answer as that person, so they shouldn't be forwarded.
No. Answers go only to you. Nobody invited can see anyone else's answer — not even whether someone else has replied. The one exception is the optional guest list: after you lock in a time, you can choose to show the names of people who said yes to it. That's off unless you turn it on.
Open the event and tap the + button. They get their own link, and you can send it to them straight away.
Open the event, tap Edit (or swipe their row), and remove them. Their answers and their link go with them. You can add them again later — that issues a fresh link.
Their link works on any device and any browser — it's the same link, so forwarding it to themselves is all they need. If it's gone entirely, remove them and add them again to issue a new one, then send it.
You do. Nothing is ever locked in automatically. The results screen ranks the times and shows which ones actually work; you choose, and only then does everyone's page update.
Once you've locked in a time, tap Add to my calendar on the event. It opens in your Calendar app, where you can add the others as attendees if you want to. Invitees get their own Add to calendar button on their page.
Everything about an event auto-deletes about 30 days after its last proposed date.
Open Settings in the app and tap Delete account. It erases all of your events and everyone's answers, and disconnects SheduleIt from your Apple ID.
Email [email protected] and a human will read it.