Your Pine address
When you join Pine you pick a username, and that username becomes your address: username@pinespace.com. It is a real email address from day one; mail sent to it lands in your Pine Mail inbox.
The same address is your identity across the suite. You use it to sign in, and it is how sharing and collaboration will identify you in Calendar and Drive.
Your display name (the name people see next to your address) can be changed any time from Manage your Pine identity in the account menu.