Please click on license management where you will find your Trial. Click on View to get access to all subscription details. There you can enter your payment method and start your subscription.
Yes you can seamlessly transition between Creator, Pro or Studio by clicking on License Management and then on button View. This will give you an option to click on Upgrade/Downgrade your product. We will calculate the new subscription pro-rata.
Yes this is possible. Head over to License Management, and click on View next to the subscription you would like to change and select Upgrade/Downgrade. There you will have an option to upgrade to annual or permanent subscription.