The previous permissions were correct, so there was no need to change them. You get the default index pahe bevcause the new index page you uploaded has a wrong name.
Please deleete the file index.html that is currently in the web directory and rename you "Home.htm" page to "index.html". On Linux servers, the homepage is named index.htm or index.html and not Home.htm like on windows servers. Additionally, it matters on Linux if you bame a file in upper or Loewercaee as these are different filenames. So it is recommended that you name you files alwas lowercase.