Change oil on 2007 Kia Rio?

Too vague? You want to know "how"? It's generally the safe for most vehicles. You want to get the car on a lift, and not use jack stands....as the old oil will "pool" and not completely drain out.

But there's a drain plug under the front of the car that you unscrew, make sure you got a pan underneath to catch it....

Let it drain, then add some oil first, to let the "new" oil drain out the rest of the old stuff, incase it didn't all come out. Then tighten the drain plug underneath and proceed to add your 3.5-4 qts of oil.

I know it's extremely vague, you might check wikihow.com - they got a good howto there