Problem with upgrading with google play

I try to upgrade my count but the website sends me to Google play witch I used to create my acount. But Google Play doesn’t propose me to change my subscription. I only can choose stopping. What can I do? I would like to pay for 1 year.
Thanks for your help.

The best would be to cancel your Google Play subscription and after your subscription there expire and your account drop to Free level, you will be able to upgrade to annual membership on the website.

It’ OK now, thank you.