basically it´s not that confusing. not even that hard. on the bottom side of the engine is the oil pan. there is a screw that when lossened it will release the oil from the pan. after that you change the filter which is located in the engine bay. get the screw in again and refill with your oil of choice. u better make sure that the oil is not boiling hot when you want to change it and make also sure not to spill any. environment rules, you know?
if you want to do it yourself, go and find yourself a DIY book. there are some outthere that should cover this need.