A dirty air filter could reduce horsepower and reduce life of your car so its really important to change your air filter every 6 months.
Obtain the Air filter first before throwing out the old one.
Open your hood and look for the airbox, Check owners manual for the location of the airbox.
Once you found the airbox, there should be clamps or screws that seals the airbox closed.
Unscrew or unclasp the airbox so you can access air filter.
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Pull the top cover open until the air filter is accessible.
Once you get it open, remove the old air filter and compare its size and dimensions to the new one. (The new air filter should look exactly as the stock filter). Discard or Recycle old filter.
Place in the new air filter and make sure it fits snug and fits really well.
After placing the air filter, reverse the steps of opening which means close the box up, re-clamp or screw the box closed and shut the hood.