A draw no bet simply works by eliminating the option of a draw from a bet. Therefore, as a bettor, you can place your wagers either on a home or away win. This means that if your predictions are correct, you win. However, if the game ends in a draw, your wager is refunded since there is neither a win nor loss.
Bet credits and bonus bets cannot be withdrawn, but they can be used to wager on other sporting markets your sportsbook has to offer. Some sportsbooks make you use your bonus funds or bet credits in one lump sum.