Put your DMP Shop in maintenance mode while you are populating the site or doing major updates. Add an IP address to “Allow These IP’s” (one per line) to browse the site while all other IP’s will get the maintenance page.
This is available under Settings. Which can be selected from the drop-down menu in the right hand of the top bar, the little user icon.
Once you set your site to Maintenance Mode, go back to Settings to add content.