Invite somebody?
The address is attached to somebody who already works here — that is how the server knows whose name to put on a change. Only people with no address yet are in the list. They will be emailed a one-time code. An invitation with no pages ticked is refused: an address that opens nothing cannot sign in at all.
Take your data out?
Ordinary CSV files, one per subject, which Excel, Numbers and Google Sheets all open. The browser will ask once whether this page may save several files at a time — say yes, or take them one at a time with the buttons above. Nothing is deleted here and nobody is told; this only makes a copy.