This thread has more info on this process: Using Gallery from Wordpress in Hype
Essentially you’ll set a Page to be your landing page (in your site’s settings), and then you’ll need to customize that page. If the standard ‘Page’ template is already pretty basic, you can simply embed your Hype document there. If you’d like to erase everything on that page so that you just have a Hype document, you’ll need to make a page template specifically for your home page and embed your document there.