Account
The first use of an email address creates the account and opens the parcel map.
An account is the email address you sign in with. The first time that address is used, the account is created. There is no separate password.
What the account holds
The account stores the email, a role, and the time it was created. If Google sends a name, that name can be stored too. Your parcels, farms, devices, and walks belong to this account. Another person does not see them.
The role is member, unless the address is the one set as ADMIN_EMAIL on this install. That address becomes the admin when that person signs up. Admin is described under Admin.
Where you land
A finished sign-in opens app.millesime.io. That page is the parcel map. In English the address is app.millesime.io/en. A visit to the app without a session goes back to sign-in on millesime.io.
The display name and the theme are on the profile, not on the sign-in form.