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Both of them will have what is called coil over ignition. There will be individual coils over each spark plug. The coils will be bolted to the center of the valve cover. Unplug the coils, unbolt them from the valve cover, and remove them. You will then be able to access the spark plugs.
Make sure you use the correct spark plug (a/c delco).
From http://www.obd-codes.com/trouble_codes/ The P0300 is a misfire and P0506 indicates low RPM at idle.
A misfire can be caused by poor ignition (spark plug, plug wire, coil, ignition module/engine control module). OR Poor air/fuel (air filter, fuel injector, fuel pressure, fuel filter, fuel pump, bad gas, or engine control module).
Check your maintenance requirements and see if any of these items are due for replacement first.