On Browser:\n\n Select the odds next to the horse you want to bet on to place: This will then add it to your bet slip where you can select the each way box, add your stake and place your bet, using the 'Place Bet' button at the bottom of your slip.
Betfair's scalping strategy is based on opening multiple positions and closing them with a small profit. In a scalping strategy, the trader tries to catch small price movements and make money from them. You are supposed to place two bets in quick succession and then make profits from the gap between these trades.