after changing the wordpress adress and site address in localhost xampp then it

Hi all, I am new in creating a website using wordpress. I am using xampp to create a local wordpress website and my website run under: localhost/mysite. I want to import my local website to my live website https://vsaftest.wordpress.com/ by going to the setting of my local website and then changed the wordpress Address and site address from https://localhost/mysite to https://vsaftest.wordpress.com/. After that then I can not access to my local site using https://localhost/mysite anymore, and inside the website https://vsaftest.wordpress.com/ there is nothing there also. I know that I made a mistake here but then anyone can help me how can I change back so that I can access my site from localhost ??