However, you'll need to get under the vehicle to see it accurately. It's a relatively straightforward location, but the exact position might vary slightly depending on the engine (4.3L V6 or other). You'll likely see a bolt or a slightly larger plug; that's your drain plug.
Before attempting an oil change, consult your owner's manual for the specific location and any important warnings. Improperly locating and removing the drain plug could lead to damage.