If you enrolled online, you should have immediately received an email confirming that you successfully signed up. If you didn't, do the following:
If you can't figure out the problem, chat with us.
AutoPay will become effective on your next billing cycle. Until then, you need to pay your bill as you have been doing (e.g., by mail, online, in person).
You'll see a message on your bill when AutoPay kicks in. For instance, it will say something like, "Thank you for using AutoPay." If you don't see a message on your bill, AutoPay isn't working yet, and you need to keep paying your bill normally.