Add the nodesgiven below to construct the avl tree show all the necessarysteps,
20,21,22,17,18,23,27,25,30,33,34

you can only change it if your real name or personal information was in it. and if so you would need to contact them directly with a username change request.

because you most likely sighned up

i'm so sorry that's not a question and this isn't an answer