How to design

@gross38970256cumn what you are trying to create it appears is cherry blossoms on a blue background. What I do sometimes is upload a photo as a reference for Firefly to use. try this as an example or play around with it

Are you asking how to create the part with the flowers or the full graphic with text?
For the flowers, you need to write a descr description with all the details you can.
Firefly is not good at inserting text into an image.

See teh page below for tips on writing prompts:
https://helpx.adobe.com/firefly/using/tips-and-tricks.html