Configuring a transactional event

Hi there, I am new to the adobe community, I just created my account yesterday and trying to create events for transactional emails and standard campaigns. I am following the link to configure the event (https://experienceleague.adobe.com/docs/campaign-standard/using/communication-channels/transactional-messaging/event-configuration/configuring-transactional-event.html?lang=en). But I am unable to see the section 'Marketing plans'.

Is that something limited to a free subscription? or I am doing something wrong? I am confused if I am following the right path or not.