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 canceled.

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