Should you have Bonus funds in your account, your Bonus balance will be displayed at the top of the page (next to your cash balance). When placing an entry, whether that be for Pick’em Pro or Contests, you will see an option to use these Bonus funds to fund your entry next to the “Play for…” button.
Selecting this tick box or toggle will use your Bonus funds to place the entry. If the entry cost exceeds your Bonus balance, the entry will be funded by your Bonus balance with any excess cost funded by your cash balance.