Hi
As I said, the files I needed in Github, I actually found there yesterday, including my md file with the display that includes all the html file puts out, and a png file containing just
my graph. But I did commit and push the 4 stages files anyway, and they were successfully sent. Github is in the process of listing them all on the first page, but I see that it
takes time for it to do that. I learned that there is a delay in the displaying of the files you send on the first page of Github, but they are all there under Commits.
And now I just discovered if I modify my code (I deleted one chunk and changed the code of another to a histogram) and knit that, my new run will cause my output to be staged,
and I successfully committed those, and saw my histogram in github.
So I thank you so much for all your patience and help. Also learned some interesting things about html from another user, so it looks like I'm hooked 
Nancy