You have to take the intake manifold off to access the rear plugs. Six or eight bolts, a couple of brackets and two bolts on the rear you can't see without a mirror. The rear plugs share the coils with the front I seem to remember. Replace the plug wires while you have the intake off.
Go to KGIS, Log in, Go to Sedona 2006 - 2014. Select 07, go to S.I (service Info), select the second option(engine mechanical system), select 'intake and exhaust system'. select repair procedures.
Follow the instructions.
What it does not say is how hard the rear bolts that secure the plenum chamber are to get to.
Have fun. do not scrimp on cheap plugs. so it goes another 80.000 before doing again.