I know how to change a username in this but you have to pay 100 gems for it and I am not doing that but so you know, I know my username says Lizzy but my actual name is mikayla. For short mi mi or as some people call me for some reason is Sugar. Sorry I got off topic but yeah you have to press the button in the left corner on top the one where its your profile picture then press the pencil next to your name and it will let you change it of you pay 100 gems.🙃😃😉😊😀