Crockd kits can be left to air dry or you can get them fired & glazed at your local kiln.
Note that every kiln sets their own price to fire & glaze your work. You can expect to pay around $15-$25 for the firing & glazing of four small pieces.
Can't see a kiln in your area? Don't fret! You can let your clay air dry - it just won’t be food safe or waterproof!