August checks every suggestion against what your household eats. It cannot do that until it knows something about you.
Pick none if there is nothing. August checks every suggestion against both — an allergy is never a suggestion it will make — and you can change either in Household.
The same Apple account you use on the phone, so this browser lands in the same kitchen.
or
In August on your phone: Household → Server → Open on the web. That hands this browser a session on the SAME account — not a second person in your household, and not a second kitchen.
The trial's door: no password, no recovery, and anybody typing the same handle reaches the same kitchen. Fine on a private network, and not an account.