Get a property in — from its tenancy contract, or by typing the address.
Your first property comes in during setup. After that, add each one from the Properties page.
On Properties, select Add property.

Type the postcode or address and pick it from the list, then Continue. That is enough — the property is in, vacant, with no tenancy yet.
You are then offered the tenancy contract. Add it — a PDF — and Alfred reads the tenant, the rent and the dates straight off it, so the property arrives filled in rather than blank.
It is optional: Done finishes with only the address, and you can add the contract later from the property's Documents tab.