To change the URL for your blogger: Click on "Revert to draft" while in edit mode of the post, and you can now change the permalink.
More here: Changing blogger post URL – Change the permalink URL of published Post
What these mean:
Permalink: A permalink is the URL of your blog post. Blogger can either automatically generate a URL for you based on the content of your post, or you can customize the portion of the URL after the date.
Title Link: Link your post title to a specific URL, or leave blank to link the title to your post.
Enclosure Links: Enclosure links help you make podcasts, MP3s, and other content in your posts playable in feeds like RSS and Atom.
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