Yes, I was using Posts slider as that is what was in the demo install. I have tried posts grid and it gives me lots of options but the buttons look different to your demo as the buttons are round and not rectangular and black. Until such time as I can upload for you to look at wp-admin panel, perhaps you could could tell me the steps necessary to make my blog page look like this:
You need remove all elements you added to your Blog page and select your blog page in Settings > Reading > Posts page.
Then go to Theme Options > Blog Layout and select Grid for “Blog Layout”.
Also you need add Read More button as shown in the article: http://www.wikihow.com/Add-Read-More-to-Wordpress