Changed the name of the user Mac without rename folders, and it does not accept the password, how to fix?

I decided after purchase to change the name of the Mac user using "Users and groups", changed but not changed the folder names. Now it is not accepting no password or a user name, but when I want to rename the folder default on my macbook but macbookpro is not in the sudoers file. This incident will be reported.
What to do?)
March 23rd 20 at 19:28
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