When you finish editing the blog, don’t click Publish yet. Pull all the way down. You will see that in the "Log Category", "Permission Settings" and "Update Updates" columns, there is a "More Settings" near the lower right corner of the page. Click on it and you will see the following arranged in order: "Eye-catching light", "Signature file", "Prohibited reprinting" and "Top". For these four settings, just light up the prohibition of reprinting.

(Remember! You must be editing to see "More Settings"!!)