Never mind.... I went back to my panel and looked at Billing again and found it. I kept missing it. In case anyone is interested, this is where to find it:
----Credit Card Auto Pay (Enabled) [in my case]
Just click on "Credit Card Auto Pay" and it will give you an option to check mark to limit DH to billing a maximum of XX dollars on any given day.
Don't forget to click "Update Automatic Rebill Settings"
That's all there is to it.