Public forms & Email In — Find your table's address
Admins find a table's address under Fields & setup in the table's header: the Email In row shows the address when the table has one, and opens the setup page when it doesn't. The empty state of a new table shows the address to everyone, so "how do records get in here?" answers itself.
Admins reach the full editor from that row (the Forms page links across to it too): change the mapping, choose who is alerted when mail arrives, pause an address, or create several mailboxes for one table.