How to change background color of NGL messages?

here is ngl app so if you go to inbox now there is a new update and then uh yeah just go open any message and in top part you can just change the color of that message so that's basically how it works yeah and then why you need to do that because when you tap reply uh it can better suit your instagram story because this message this color will be included in your instagram story and that's how it works so yep hope this is helpful