Select from options: Continue writing the next sentence.

How to block someone on tumblr 
Log into your tumblr account to access your dashboard. 
You can block a tumblr user from being able to interact with you right from the dashboard. To open the dashboard, log in to your tumblr account on the web or in your mobile app.

OPT:
 -Right-click on the tumblr user you want to block. You'll see a box appear to the right of their name.
 -Click (or tap) the avatar of the person you want to block. This will expand that user's blog on the right side of your dashboard.
 -Locate the " block the user " button on the toolbar at the bottom of the dashboard. It's the icon of a multicolored envelope with the button that says " block username " below it.
 -If you choose to block the user from already having been blocked, the following action applies: all content that has not been blocked has been temporarily blocked. This means that posts currently blocked are been forever blocked on tumblr.
Answer:
Click (or tap) the avatar of the person you want to block. This will expand that user's blog on the right side of your dashboard.