How to get an emoji in your instagram username?

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I've seen others on my friends list with emojis in their usernames on instagram. I have an iPhone and have the emoji keyboard enabled. When I try to add an emoji to my username it says you can only use letters, numbers or underscores. How do I add the emojis? Please dont say "you can't" because I HAVE seen others on my friends list with the emojis in their usernames, so there is obviously a way.
I actually figured it out on my own. You can only add the emojis to the first and last name lines right above the username line.

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Maybe something is wrong with your phone. I just created an instagram & I used an emoji and it worked perfectly.