You can do this right from the poker client.
- Log in to your poker account
- Click My Account at the top right of the client.
- Then click on ‘Withdrawal’
- Then ‘Account’
- Then ‘History’
- Click on the ‘Pending Withdrawal’
- Finally, click ‘Cancel’.
Please remember that if your payout status is listed as ‘processing,’ it won’t be available to cancel. Only withdrawals with a status listed as ‘pending’ can be canceled.