This article assumes you have added a template from the template library to the Studio page.
Once you have a digital signage design you're happy with, click the Save button at the top of Studio.
Give your template a name, and select the folder you'd like to save it to.
Click Save again.
It will then be accessible from the "My Content" tab on the left to edit or schedule on the Manage page.
When you want to send the design to your screen, click Send to Display.