Let’s say you’re moving from one service to another, to update your origin url use the following command :

$ git remote remove origin
$ git remote add origin git@github.com:your_account/repository.git

If you get an error message like this :

You asked me to pull without telling me which branch you

Do the following :

$ git remote rm origin
$ git remote add origin git@github.com:your_account/repository.git
$ git pull
$ git branch --set-upstream master origin/master
$ git pull