Hi Fae -
That's strange, I see the featured image on the front page now, and did the last time as well:
If that's not what you see (or that's not what you're talking about) can you please send me a screenshot? Here are instructions for how to make a screenshot: http://en.support.wordpress.com/make-a-screenshot/
You can upload it to your blog's Media Library and I can look at it there.
On blogs, typically the navigation to the previous post is on the left (since that post is older), and to the next post is on the right. This is because blogs organize posts in reverse chronological order, so it's as if you're scrolling left-to-right, oldest-to-newest.