When you are done creating your App you can start the process of Submission and Publishing on the Stores.
To start the Submission process click on the Promote tab at the top on your dashboard:
And then on Publish on Stores from the the left hand sidebar menu:
The only publishable App is a Native App, which you can create only
with a Premium Plan.
You need to have a Developers Account in order to
publish your Native App on the Stores.