Yes, they can. The Property Manager can also change resident data through Yipy Web Management when needed. This is meant to help residents in certain situations, for example when a resident has trouble updating their data on their own or needs their information adjusted to match the property's administrative records. With this access, the Property Manager can make sure the data stored in the system stays accurate and consistent with internal records.
Even so, any data change should be confirmed with the resident first, to keep the information valid and avoid administrative errors.