Thank you. I had not seen the list of screen shots on that page. Still, although I see info on how to create and manage a gallery, I don’t see anything there about “how to make the gallery appear in the blog.” If anyone has the time to explain this most basic step I will be very grateful. Thanks.
I resolved this myself by trying it and I got the result I wanted: the older posts, which came from importing a second blog, appear as older in the new blog.