That’s all you need to do. But there is a chance that it wouldn’t work if you use some themes that don’t use regular WordPress loop to render front page articles. If you use some premium theme and you don’t see rating on the front page, than most likely that theme is not using standard loop and you need to add call to render stars into the theme.
You can give me more details about the theme you use and some test blog, I could see what is the problem.
FeedWordPress is the problem. I have send email to the author of this plugin to look into that, but so far I have received no feedback. FeedWordPress adds a filter hook into the post rendering that has a bug preventing any other filter to render contents including my Star Rating plugin.
Until they resolve this, there is nothing I can do.