Ultimate Facebook - options for posting

Hi team
I've installed Ultimate Facebook to post blog posts automatically on a Facebook page. When I create a new blog post and publish it, the post is not visible on Facebook. If I open the blog post in Wordpress again a tickbox has appeared under 'Facebook publishing' with the option: 'share this post on Facebook'. If I tick the box and then save the post, the blog post does show on Facebook.
Questions:
1. Should the blog post be shared in the first instance on Facebook? As this is what I had set it to do (autoposting)
2. The tickbox to share this post on Facebook appears after I have published the post and re open it, and is not visible when I create the post.

I'd like to autopost, without having to tick boxes everytime. What can I do?

Thanks
Ellen

Attached two print screens. One showing thee 'Facebook publishing options' when I create the post. One showing these options after re opening it.

Thanks
Ellen