Citibank Online lets you set up or amend future payments easily.
Click SCHEDULED TRANSACTIONS to see your current list of regular payments.
To see more detail on a specific payment, click the plus icon.
To amend the payment, click EDIT...
...then change whichever aspect of the payment you require (e.g. date, frequency or amount).
Now click CONFIRM.
To delete a scheduled payment, click the plus icon beside it.
Now click DELETE, followed by OK to confirm.