A Loose build is recommended for best absorption and capillary action, and helps to avoid a dry core, but experimenting is key to finding your personal preference
Start with desired amount of cotton/wick and twist between your fingers
Thread cotton/wick through your coil(s), ensuring a loosely snug fit
Trim and Tuck your cotton/wick into the build deck, leaving an air gap directly underneath your coil to prevent overheating
Drip your favorite eliquid onto the cotton/wick, and allow for complete absorption