Flow diagrams

I would like to understand what the user flow is through all the payment pages. For example: What does a user see when they try to renew if they already have a subscription? The help text on the Subscription page notes ” You can renew, cancel or upgrade your subscriptions by using the forms below. ” but there are no buttons to do that. Also, is there a page where a user can see their subscription and when they will expire?

It would really be useful to have some process flows so I can see what is supposed to happen and the page that is served up.