Quick answers.

Classes → Add class, or Import schedule to read a calendar export, a screenshot or pasted text from your school's timetable. Each meeting can be a lecture, lab, tutorial or seminar. Review everything before it's saved.

Only after you both accept a friend request or one of you opens the other's invite link, and only while sharing is on. In Privacy settings you can share just busy/free instead of class names and rooms, or stop sharing entirely. Assignments and notes are never shared.

Yes — Schedule → People → “Add person.” Only you can see them, and you type in their classes yourself.

Open the ••• next to their name (Schedule → People) or go to the Safety Center to report or block them. Blocks are silent and reversible.

Settings → Account → Delete account. You type your username to confirm; everything you own is removed immediately.

There's no email reset yet. You can log in with either your username or your email; if you're signed in on another device, change the password from Settings. Otherwise, contact us.