Login to your account and click the create button and choose to create Repository.
Fill the following form with the repository name, description and visibility.
Note that the name of the repo is always addressed with the name space e.g. washraf/repo this is used to differentiate the original images created by the docker team from the images created by normal users.
Using the login command you must supply your username, password and mail to configure your docker daemon with your account.
$sudo docker login Username: blabla Password: Email firstname.lastname@example.org
$sudo docker push walid/test
Make sure that you have a repo by this name or do this command:
sudo docker tag walid/nginx username/reponame