drain all of your oil. there is a plug at the bottom of the oil pan. keep the plug off and drive for about 2 miles. after the bulk of the oil is drained. this will get all the old oil out and it will just drip into the street as you drive. park it. put the plug back in. then i like to put a few extra quarts of oil in. this will probably help you too since you were low on oil. put the cap back on and you are good to go. You might also want to run sand through your throttle body to port and polish your intake manilfold while you are at it.

...or you can have someone that knows what they are doing show you