connect local repository to remote git

git remote add origin <remote_repo_url>
git push --all origin

If you want to set all of your branches to 
automatically use this remote repo when you use git pull, add --set-upstream to the push:

git push --all --set-upstream origin

git init
git commit -m "[message]"
git remote add origin "github repository link"
git push -u origin master

git remote add origin <remote repository URL>
# Sets the new remote
git remote -v
# Verifies the new remote URL
git push origin master