The starter on a 2007-2010 Chrysler Sebring 2.7L V6 convertible is located on the
passenger side (right side) of the engine, generally near the bottom, and somewhat behind the engine. Access is usually easier from underneath the vehicle.
Because of its location, you'll likely need to jack up the car and use jack stands for safety before attempting to access or replace the starter. It's a job best left to someone experienced with automotive repairs.