So, the way a blog works is this: Any new posts will show up under your blog. First you need to Add a New Page called "blog" or whatever you want to call it. You don't need to put any text on the page, just enter a title and submit.
Then go to Enfold > Theme Options and where it says "And where do you want to display the Blog?" select the Blog page you just set up.
Then you probably want to add it to your menu so people can see it on your site. You can do this by going to Appearance > Menus and adding the blog page to your menu.
Once that's done, make your first blog post by going to Posts > Add New.
You can modify the look of your blog in the Enfold settings under Blog Layout.
There might be a sidebar that shows up by default, you can edit it under Appearance > Widgets > Sidebar Blog.
Or remove the sidebar by going to Enfold > Sidebar settings.
Here's a helpful video that shows you how to set up a blog post.