How to Remove a Tumblr Blog from Search Results: Not everyone on Tumblr wants blog posts to be found by others. Follow these steps to hide a blog from search results and recommended posts.
Go to the Desktop Dashboard. Click the user icon to reveal the drop-down menu, then click the Settings gear icon.
The Settings page for your primary blog appears. (Or to hide a secondary blog, click another blog on the right sidebar.)
Scroll down to "Directory" and look for the setting "Allow search engines to index your blog."
Click off the switch — that is, make the circle shift left — for "Allow search engines to index your blog." A green "Saved" icon appears, confirming your choice.
Turning off this setting hides the blog from Tumblr Search and prevents posts from appearing as recommended posts — now known as "Here's a blog." The setting change also puts out the unwelcome mat for search engines like Google, Bing and Yahoo, asking them to eventually exclude the blog from search results.