If you want to restrict access to a WordPress blog post or page, then you should password-enable the page. To do this:
- In the administration pane (while creating a new post), “Post Password” is the third entry in the right-hand navigation.
- Click the “+” to expand the menu and then type a password into the field.
- The post or page will be linked in your navigation, but the page will prompt for a password (see screenshot below – click image to see larger version).
If you want a page to be viewable only to yourself — and not linked in your navigation — set the post to private.