Don't lose hope, you're 98% there!
Looking at your screenshot, you aren't quite in the right place. Look at the top right window. The folder that is highlighted is named '\' (root). A little further down and you see 'public_html'...click that.
Now look at the bottom right window. Do you see your site? It should have a folder named index_htm_files and a file named index.htm amongst others (see a screenshot of one of my sites below).
Let us know if you do.
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