Locate your orange dipstick.

Remove it and wipe off the oil, then replace it.

Remove it again to ensure the oil is at the proper level between the two holes, or slightly above.

If it's too low, you can add more - repeat steps 13 and 14 above accordingly. If it's slightly above, don't worry; some will drain into the new filter. If it greatly exceeds the maximum level indicated by the upper hole, you'll need to drain some - refer back to steps 3 through 6.

Replace the dipstick.