When you win a free AUD contest, the amount of AUD you have won will be deposited into your "Promotions" account.
To access this, click on your balance on the header of the website and it will display your current "Available AUD" amount and "Promotion AUD" amount. Or you can visit your eWallet and click on the "Promotion" tab to view your balance and transactions.
Promotion AUD works exactly the same way as Available AUD, except you can't withdraw Promotion AUD. You can use it to enter paid contests and place bets, but the bet must be with odds equal to or greater than 1.7. If you win the bet or contest, the winnings will then become Available AUD and you can withdraw the funds.
When placing a bet or entering a paid contest, the money will always withdraw from your Promotion account first and then your Available account.
This is done so we can differentiate between the free to play/promotional contests and the pay to play contests/betting.