Check existing remote:
git remote -v
# origin <https://github.com/username/repo.git> (fetch)
# origin <https://github.com/usernam/repo.git> (push)
Change repository URL:
git remote set-url origin <https://github.com/username/repo2.git>
# Change the 'origin' remote's URL
Verify new remote URL:
git remote -v
# origin <https://github.com/username/repo2.git> (fetch)
# origin <https://github.com/username/repo2.git> (push)