How would I change basic things of the ROBLOX chat like the default chatbar text using its api.?

I would like to change this:

Click here to see the image.

However, I can't figure out how. I want to change the text from "Tap here to chat" to "Press here or press "/" to chat."

I can't seem to do that. I went into the chat's main script and directly modified the text but the changes get overwritten.

I'm not sure how to change this aspect.

Also, one more thing. I want to change the chat window and chatbar's default transparency when the mouse is hovering over it or "/" was pressed to 0.8. How can I do that? Is that even possible? I've been trying to change through main script but its not applying the changes.

Could you offer direction or help, anyone?