The People’s Warden is elected by the congregation at its annual “vestry” meeting, sometimes referred to as the annual general meeting.
A second warden, called the Rector’s Warden, is appointed by the incumbent. [Canon 7.7 and Regulation R7.7.1].
Together, the incumbent and wardens form the group of dedicated people who provide the core leadership for the local “vestry” or congregation. This leadership triumvirate is quite Anglican in its creation—it is a pragmatic form of governance. The wardens, by and large, look after the “temporal” affairs of the congregation: money, property and governance. Although the two wardens are often called the Rector's Warden and the People’s Warden, those titles only reflect how they were appointed or elected. Their roles and responsibilities are exactly the same; they act jointly. [Regulation R7.7.1 C].
Link to more information about Churchwardens