I can't insert my photo into it

Also, there isn't a way to modify uploaded images in Firefly using text prompts. 

You can try using Generative Fill in Photoshop to modify images using the tools provided. For more info, see this article https://helpx.adobe.com/firefly/using/add-objects-in-an-image.html

Can you answer the following questions to the best of your ability?

• What device, browser/version, and module are you using?
• Please include any screenshots/videos of the issue.
• If you're running into a prompt issue, please share the prompts you're using.