You are able to unenroll your accounts in automatic payment from the billing summary on the account page. Just click "update" next to the payment information, then "unenroll" on the next screen and finally "save changes" to confirm.
Be aware that if payment has already been charged or drafted from an account, unenrolling in autopay will not stop payment from being made. You or the insured will need to contact the bank that payment is being remitted from, in order to stop the payment.
Please note you may need to refresh your page to see the changes reflected.