Post Options - Post Password
You can assign a password to a post. Scroll down to Advanced Options on the Write > Post screen. This will allow those who know the password to enter it and read your post but others will only see a box for a password:

Note:
- If someone has been given a password by you, they can see every post you protect with that password.
- If you want to check what people see, use a different browser.
- The post will not be visible in a feed - it will still be protected.
