There is a way to do this But actually only during the creation process at the beginning. Probably most here are looking on how to change username after account is created which cannot be done. But during the process of validating the account there is actually a way to change it.

When you first choose a user name and you proceed to validate your phone number and confirming he first link you get via email. After you do this you receive a notification saying that thanks for validating your phone and that your new account is under review. After some hours, you get an email saying that your account has been approved and that you need to finish the procees by clicking on a last URL to accept the terms and agree on final time. It is during that last confirmation on the TOS page when you enter the password for the first time when you have your last chance of changing the username. If by mistake you first chose something you dont like, the only way to change it is on this last process page right after agreeing to TOA that the username field is still editable and you erase the first username you shoce and select another one. I just did it on a second account I have.

I just wanted to clarify and share this, thanks Steemit family.