How to change background color or background image in NGL app?

he will send your app and if you go to inbox and then you can see some messages so basically to reply when you reply you can change the color of reply also you can upload a photo to set as a background for reply and then it works something like this so yep that's basic and then you can just reply to your story or your friends and yeah that's basically how it works so if you didn't know about this feature that's kind of a new features I added