Did you have a question about autopay?
You just need to add your CC to your account under the payment tab, then select 'manage autopay' and follow the prompts to register your card and receive $2 discount every 30 days.
It's a good idea to set up autopay whether or not you intend on having the chosen card charged for renewal. As it's been covered already, you'll get a $2 per 30 days credit for having the service enabled. You can set it up and still add payment vouchers and still receive the autopay discount.
What are you asking for? Do you want to learn about autopay? You will have 2CAD discount from your current plan if you sign up for autopay.