Publishing a GoCanvas App sends it out to your users so they can fill it out on their mobile devices.
Inside the GoCanvas App Builder you will SAVE your GoCanvas App and then hit the PUBLISH TO DEVICE button.
Now choose the users in your account that need to use this particular GoCanvas App.
Hit the Publish button when you're ready. If you want your users to receive notifications on their devices when you publish the new App, make sure the Send Notification checkbox is activated.
Congratulations, you've just published your first App!