Enabling the password page
To hide your storefront from public access, you can Enable password in the Preferences of your Online store.
Customizing the page with the theme editor
To do this, go to Customize, then select Password page from the pages dropdown.
After the search has completed, you should see the Password page section appear under Sections in the left sidebar.
Add a logo to the password page
Add a Logo image to display in the top left corner of the top bar. Click Select image to upload or choose an image from your files.
Images added here should be 200 x 80px .PNG file.
Add a newsletter signup field
Select Enable newsletter signup to gather emails for newsletters and other marketing efforts. Any emails provided here will be stored in Customers found in your Shopify admin. Shopify will segment your purchasers using the tags/tabs along the top. If they have opted in to your newsletter, their email will be displayed under Accepts marketing.
Show social media information on password page
If you want to display links to your social accounts here, you can do that by checking Show social title and Show social icons. Connect your accounts using the Theme settings options at the bottom.
Match the language with your message
If you want to customize any of the language on your password page ("Find out when we open" or "Follow us out there") you can do so from Edit languages > Password.