To be absolutely sure, you should:
* Consult your owner's manual: This is the best resource for the exact location and instructions for changing your oil filter.
* Use a repair manual specific to your year and model: These manuals often have detailed diagrams and pictures.
* Search online for images: A quick Google Images search for "[your year] Dodge Ram 5.9 Cummins oil filter location" should show several pictures.
Remember to always take safety precautions when working under your vehicle, such as using jack stands and wearing safety glasses.