If you need to Block Comments on your blog there is no direct option in blogger. But you can block comments in a single post. This tutorial will show you how to block comments completely from your blog.
For this Follow these steps
Step 1: Go to blogger Dashboard
Step 2: Click on Template then click on Edit Html
Step 3: Press Ctrl+F to Search.
Step 4: Search for the code ]]></b:skin>
Step 5: Just above ]]></b:skin> Paste the Below Code
#comments {Step 6: Save Your Template.
display: none!important;
}
****If you want to enable comment box just remove this code.