Welcome … this forum is more suited for WordPress selfhosted not WordPress.com sites.
However … reading the WordPress.com theme documents it says
The Showcase page template offers a featured slider for sticky posts. If you’d like a post to appear in the slider, mark it as sticky and assign it a featured image that’s at least 500 pixels wide.
So please Add a new post and mark it as sticky and add an image. If you’re still stuck, try the WordPress.com forums.
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