check remote

git remote -v

remove old remote

git remote rm <remote-name>

check remote that its gone

git remote -v

git add new origin and push

git push <https github link to repository> +<local branch name>:<remote branch name>

For Example: git push https://github.com/hypnoJerk/effective-octo-lamp.git +devbranch:master

Add New Remote Origin

git remote add origin <https github link>

delete the old master branch

git branch -d master

Download master from remote

git fetch

Switch to master branch

git checkout master

You now have two local branches (one master, one your starting branch) and they match two branches on remote with the same name