Password-protected blogs are exactly what they sound like, they cannot be viewed until the correct password has been entered. You can customize the theme and add members just like any other secondary blog, but the blog cannot be followed (and therefore won’t show up in anyone’s dashboard), and its posts cannot be liked or reblogged. Also keep in mind that all the admins for these blogs have the ability to change or remove the password protection.
To password-protect a secondary blog (only possible on the web, rather than in the app):
- Click "Settings" under the account menu (the person silhouette) at the top of the dashboard.
- Click your secondary blog name in the menu on the right side.
- At the bottom of your blog settings, enable “Password protect this blog.”
- Enter your desired password. You will see a green “saved” indicator to let you know you’ve password-protected the blog successfully.
Note: You can't password-protect a primary blog, but you can hide your blog from search results, and you can hide your blog from people who aren't logged into Tumblr (for instructions, check out the last bullet point in our article "Blocking users"). And if you still feel shy or skittish about the stuff you’re posting, you can always start a secondary blog and password protect that.