git push

i am trying to push from local repo to remote and getting follwing error

remote: Permission to santoshkrgupta/FirstGIT.git denied to santoshg1985.
fatal: unable to access ‘https://github.com/santoshkrgupta/FirstGIT.git/’: The r equested URL returned error: 403

The first thing you should do when you install Git is to set your user name and email address, you can easily do with those commands:
$ git config --global user.name “Your username”
$ git config --global user.email “youremail@example.com

you have to go to your windows box and check for credentials manager

remove the password for the old github repository

and try again push new repo it will work