Your Piledriver has a Honda GX50 four stroke engine. It is rated at 2 hp and has the capability of running at an angle or even upside down without harming engine.
Your dipstick for checking the oil is on the front of the engine. This is where you will add oil and also where you would dump it to change. Simply remove the front bumper and place a pan on the ground and tip the machine forward until empty. Refill the oil until it shows full. *Make sure the machine is level. When done simply put bumper back on.
Make sure you check the oil often, there is no low oil shutoff on this engine.
Before you start the engine simply flip the choke to the top position. When it starts flip lever back down to middle position until it warms up, typically 10 seconds or so, then push lever back down and your ready.
Your gas tank is located directly below the choke and is easily accessible. NEVER use low grade gasoline, always use high octane fuel. Bad gas can cause the small ports in the carb to clog affecting the engine performance.