You can both let the candle melt away out on its own (try to acquire a modest candle when you do this, so it’s not left unattended burning) or snuff it out (soaked your fingers and pinch the wick, or make use of a candle snuffer). The lunation illuminates this https://www.trulydivine.com/transits/sagittarius-full-moon-june-3-2023