Enter your master password to unlock
Your vault is encrypted with this password. If you forget it, your data cannot be recovered — there is no reset. That is what keeps it secure.
Tip: don't paste your real, live password just to test it — type a similar one. Save it here only if you want this app to remember it for you.
Your backup is an encrypted file — only your master password can open it. Save it somewhere safe (e.g. Google Drive) so you can restore it if you lose or reinstall the app.