How Do You Unblock on Tumblr?by Joshua Phillips
When you block a user on Tumblr, that user can no longer message you or view your blog. To block a user, you must manually enter a Tumblr user's name to your Ignored Users page; this presents a margin of error as you may accidentally ignore a user you didn't want to by misspelling a username. If you find that you've ignored a Tumblr user you had no intention of ignoring, you can unblock that user from your Ignored Users page.
Click the "Account" icon at the top of the Tumblr homepage. This icon is in the shape of a gear.
Click the "Ignored Users" button at the bottom of your Tumblr account page.
Click the "Stop Ignoring" button next to each member you want to unblock.
- There is no way to unblock multiple users at once; you must manually unblock a single user at a time from your ignore list.