You may need to refresh your browser to see the change. F5 key on keyboard. (sometimes control+f5)

Did you save the page as index.html or index.htm?

Did you create a site and put in the ftp information?

Once you have done that, you can up arrow (upload) the page.
It will override the current place holder page.

Check in your remote folder in dreamweaver to make sure it is in there. It needs to go into the same directory folder as the place holder page.