You are able to cancel a Withdrawal by going to the Withdraw section when logged into your account.

Find the Withdrawal that you wish to cancel and click on "Cancel" on the far right-hand side as shown in the below image:

Kindly note that only withdrawals with a status of Waiting Info and Waiting Approval can be cancelled.

When you would like to proceed, click "Yes" on the prompt shown on screen and your withdrawal will be cancelled straight away.