Air filter

Look under the hood you will see a big black box. Usually with metal bands(clips) holding it down pull up on the bottom portion of all of the clips then pull top off.

also check the following
Kiatechinfo.com will get you all the information you need when working on a kia 2nd only to a chiltons or haynes manual.

For kiatechinfo.com register (its free) then select the information for your car make model engine. Then either do a search for timing belt or pick from proper items in cloumn to the left.