The editor works by dragging headlines and devices around a canvas, with panels on either side. That needs a mouse and a wide window, and there's no touch version yet.
Open this link on a computer to start building screenshots.
Meanwhile, see other apps by Mashlab.
The page arrived but Vitrine's app bundle never ran, so there's nothing here to draw.
Reload the page — if it keeps happening, the server is serving a broken or half-written build.