You can update information for your listings by visiting the listing page and updating your host notes. Please be sure to note that host notes should only include general information that applies to all guests staying at the specified listings.
Once you've added a host note and saved it, the sandbox will disable while it syncs. Once it's completed you can return and test the sandbox on the new information from your host notes.
Please note that the sandbox feature uses a less advanced version of the AI that is used to answer guests.