The below steps are for the default beta view. If you are in the Classic view, select Switch to Beta.
To delete a withdrawal address on your account:
1. Sign in to your Kraken account and navigate to the Funding tab.
2. Click Withdraw and select the currency of your choice, e.g. BTC.
3. Click Manage account addresses.
4. Delete the desired withdrawal address by clicking on the red bin icon.
5. The withdrawal address has successfully been deleted.