The invention is an apparatus and method of using same for controlling the positioning of one or more of the seats for a vehicle, such as a double stroller, with an actuating mechanism beneath the seat that controls the seating arrangement from a tandem arrangement to a lateral arrangement and vice versa, in addition to the seat's pivoting, sliding and revolving. The apparatus comprises a frame anchored to the stroller, the frame having a plurality of stop members and supporting a ring carriage; a ring revolvably captured within the ring carriage; and an actuating mechanism beneath the seat, the mechanism comprising: a handle and a support housing for supporting the mechanism over the ring, for housing a sliding means for sliding the seat, and for supporting a revolving means for revolving the seat, along with the ring, around the frame and a pivoting means for pivoting the seat.