To manage your account subscription, you need to log in to your buyer’s account on Freemius using the credentials you received at your registered email address when purchasing the pro version of the plugin, as shown below.
Once you have logged in to your Freemius account, click on the menu link labeled Renewals and Billings. After clicking the link, you will see various renewal details, where you can perform actions such as changing the current plugin plan, canceling your subscription, updating payment methods, and more, as demonstrated in the screenshot below.