Anyway to un-publish the blog?

You can't unpublish. When it happens to me, I put a big DRAFT message on the first line in red font.

yosoufe  I haven't used it myself, but have you tried the Delete button on the right side of the screen?

Thanks,

I tried delete. But delete, means uploading all the images again and also there is a chace to click the publish again by mistake.

I am going with the "DRAFT" option.

Tthere isn’t a way to unpublish and this does catch people out - Jan’s suggestion is the best for when you do it.  The workaround we’ve settled on is to set a publish date as soon as you create the blog post, before typing anything.  Click on advanced at the bottom, then set the publish date a long way into the future.  That way, even if you do press Publish instead of Save as Draft, nothing will appear until the date.  When you are ready to actually publish it, then just remove the date and publish.

Thanks. I did not know that. That is useful.