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Addresses
What you can do with it
Save an address
Addresses can be added from the account area or during checkout, and are kept against the account for reuse.
Reuse one at checkout
Saved addresses are offered during the delivery address step, which is the point of saving them — a repeat shopper does not retype.
Edit or delete
Addresses can be updated as details change, and removed when no longer wanted.
Enter one with assistance
Stores can offer address autocomplete, which fills a full address from a partial one. This is worth using: an address that matches a known location is less likely to fail the delivery radius check for a formatting reason.
Why an address can be rejected
The usual cause is distance rather than correctness. Local delivery works within a radius of the fulfilling location, so a perfectly valid address outside that radius cannot be delivered to from there.
Where a brand runs several locations, another may cover it. Where none does, shipping may still be available if the store offers it.
Guests
Guest checkout collects an address for the order in hand, but with no account there is nowhere to keep it, so it is not available next time.