All Lumas are identical. Any Luma can be used as a hub or as a node, though after setting up a 3-pack, the Lumas are designated in their roles until they are factory reset.
Download the Luma app.
Follow the instructions (or download the guide from here.)
The app will walk through how and where to plug in the Hub and then setting up the subsequent nodes.
For all other inquiries or issues, please contact Support at [email protected] or (800) 684-5862 for live support.