Carefully screw the new oil filter into place. Remember, it has oil in it so don't forget to hold it upright. It screws on clockwise.
You don't need a wrench to install the new oil filter. Screw it on as tight as you can get it with one hand. Overtightening the oil filter can strip its threads and cause a leak. Of course, not tightening it enough can cause a leak. So screw it on as tight as it will go with one hand, but no more.