If you are a using a Instagram and you want to customize your nametag then you must have a Android phone or iPhone. Remember one thing that on web browser you can’t change your nametag or customize it.
So, you have to just open the app in your mobile then
Go to your profile and tap on 3 Dashesh.
Then from there tap on Nametag.
Now to customize it just touch anywhere on the screen or you can tap the button at the top or try other designs also.
After tapping you can use color (switch between different colors) or emoji(you can choose lots of emoji) or selfie (lots of selfie stickers) to take photo.