Password protect single page

1. Log in to your website.
2. From the dashboard, head to Pages.
3. Click Edit on the page you want to hide.
4. In the top right corner, under the Status and Visibility settings click the Public link.
5. From there, select the Password Protected option to protect your page and enter a password.
6. Then click Publish or Update.

Now when viewing the page you’ll have to enter a password.