The "My Apps" tool lets you create and deploy apps on JuliaBox. Apps are useful for running long running work loads or web servers. Click on the "My Apps" icon to open the dialog. You may enter details for your app or you can directly hit the "Deploy" button to start the default app.
The code for the default app can be found at
/juliabox/myapp/main.jl. Once you hit deploy you can wait for the link to be generated (if your app is a webserver). Or, you can close the dialog and see that an icon for your app appears on the dashboard. This will open additional settings that will let you Start/Stop/Link or Delete the app. Additionally you will also find a "short link" that you can share with other users.