To upgrade, click your profile letter on the bottom left, then navigate to Settings -> Plans -> AI Creator and select the plan you want to upgrade to.
Go to your Account profile.
Choose Settings.
Go to Plans -> AI Player.
For first-time users, you will see a free trial offer 🙂. If you have already upgraded but it is not reflecting, try clearing your cache and cookies, then logging out and logging back into your Tolstoy account. If it is still not working, our support team can further check it.