add remote heroku
# remote list
git remote -v
# add heroku app remote
heroku git:remote --app brenda-kp
git remote -v
# heroku https://git.heroku.com/brenda-kp.git
# rename local remote
git remote rename heroku staging
git remote -v
# staging https://git.heroku.com/brenda-kp.git
git push staging master