Cut your coco liner to fit inside of the lantern with just a pair of scissors. The small lanterns each used a half of a liner each while the large lantern used almost two full liners. You will want to account for that when picking up your supplies. Then just line each lantern with the coco basket liner.
Once you have covered up all of the holes with your lining, just add in potting soil and any plants that you love. If you want to help the planters hold water a bit better, add a plastic bag inside of the coco liner before adding the dirt. This will keep your plants from drying out too quickly.