Select the entire image and open Generative Fill from the Edit menu

Choose Select > All to select the entire image. Then from the Edit menu, choose Generative Fill. Accessing Generative Fill from the menu provides a larger area to enter your prompt and can make it easier to see and edit longer prompts.

Choose the FLUX Kontext Pro partner model

This model is good for conversational prompts and editing high-res images, and it works very well for changing text in an image while preserving the original style of the text, even if it is a large, illuminated sign, as with this example.

Use quotation marks for the words you want to change

Write your prompt instructions for changing the text and place the text you are changing, as well as the new text, in quotes so your intent is clear.