When making a selection on a sports event you’ll be offered the opportunity to make a number of changes to your bet that will either increase your chances of earning a payout, or increase the payout that you can earn from that bet.
When you click on the odds for a selection at an online sportsbook you will be asked to enter a stake amount, and then given the option to pursue:
Paddy Power offers a £25 free bet to all new punters.