The header is a component created for you according to your specific requirements. It is part of the Articles, Events, and Podcasts templates and in most cases contains a large image or an image with an audio file and a placeholder for the title and subtitle of your post. This component is blocked (locked). This has the advantage that it cannot be moved accidentally. Learn more about it here.
Edit blocked components
Blocked components like the Article, Event or Podcast header cannot be edited as usual in the radiosphere Studio Editor using the settings on the right. There you will see that this element is locked:
To edit a header you have to use the advanced settings for posts. You can access them by clicking on the drop-down icon next to the post title in the upper left corner. Click on the open book icon to open the advanced settings.
Under Attributes you can now change the title of the post as well as add a subtitle. Upload the header image under Image. If you don't know how to do that, you can read about it here. You can also add tags and a summary for your post here. You can link the author of the article by clicking on the blue backgrounded add below Authors.
Collapse advanced settings
Click on the one-page icon to the right of the expand icon to collapse the advanced settings.