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A friend in Australia (they all say "Oz") says: Find the "Customise" button, then click "add an element to blog."
I found customise, but Help on my blog has a different process.
Mars Ranger-Copyright Kyi May Kaung
So now I am trying to upload Mars Ranger, for which The Northern Virginia Review gave me a Best in Show prize (see article What I Won was Best in Show).
Here goes -- IT WORKED! Now it's so easy, it's scary.