You have to create a Google app engine which is linked to your Google account. Google App Engine is a Platform as a Service (PaaS) cloud computing platform for developing and hosting web applications in Google-managed data centers (ref: Wiki).
AppEngine is considered a “less secure application” usage by Gmail. You need to enable reduced security levels during the running of the upload script, before you go to the next steps.
Sign in to the Gmail account and click on ‘Connected apps & sites’.
Switch on ‘Allow less secure app’.
Without this you will not be able to create the application!
Now the application can be created.
You will be automatically directed to the page below.
Confirm your email address and the page below opens.
Click on ‘Google Developers Console’.
Click on “Create an empty project”.
Provide a name for your application, check the boxes and create the application.
Congratulations, The application is created!
Write down the ID: ‘openartfishyourcountry’ of your application.
This is needed for installing ODK on your computer and on your server in the cloud.