I am assuming that you have a 104 engine, that means it is an inline six cylinder. The vehicle should be run to normal operating temperature then shut off prior to changing the oil. To do this, safely raise and support the vehicle. Inspect the lower panels, some have openings to access the oil drain plug, others you may have to remove the panel. the oil drain plug is in the aluminum oil pan and has a 13mmm hex head, remove the drain plug without getting oil on yourself and let oil drain into a oil resistant drain pan. Let oil drain for at least 5 minutes. The filter should be at the left side (driver's) of the motor toward the rear. It should have a plastic cover that needs to be unthreaded to expose the filter element. The cover requires the proper wrench to remove it without damage. If you damage the cover you will have to replace it, otherwise you will have oil leakage. Remove the old element and recycle it,(do not put in the trash) install the new element onto the cover, change the cover seal and lubricate the seal. thread the cap back on the housing and torque it to 25 Nm. Change the seal on the drain plug and reinstall it, do not over tighten, it should be around 10-15 Ft lbs maximum. Then you can replenish the oil. Get vehicle back on the ground, replace oil filler cap, then start motor and run for a couple of minutes. Make sure the oil pressure warning goes off with a few seconds of starting, then check for leaks. Shut motor off let sit for 5 minutes, then check oil level and adjust as necessary. Good luck.