From the Dashboard click Blog followed by Add Post icon. Most of the fields should be self explanatory but a few need extra explanations.
The Slug will be used to name the posts page within the URL, the Slug is relative to the location of the Document holding the posts category, therefore if the post Slug is blue-widget and the Document has a URL of http://www.example.com/widgets/ then the URL of the post page will be http://www.example.com/widgets/blue-widget/.
The Meta tab contains the fields associated with the meta data placed in the <head> section of the page holding the full contents of the post.
The Feature Image tab allows an image to be uploaded or read directly from a location on the internet, this image is then used as the feature image for the post. The feature image is shown next to post abstracts and within the post body depending on the design you implement.
The Open Graph tab allows the information being presented to social networks such as Facebook to be configured, this information includes an optimized image, title of the post and post description. If the fields under this tab are left blank then the blog module will do its best to fill the Open Graph meta data with appropriate information.
To ensure that the Open Graph data is presented properly to the networks, the [[$blog.ogMeta]] chunk should be placed in the <head> section of the template being used for the blog.
Locate the post to edit and click the Edit bottom to the right of it, the blog post will then be placed in to edit mode, this is the same form that you used to initially add the post to the blog.
If comments are enabled under Settings > Blog > Comments, then comments can be enabled on individual posts by checking the Allow Comments box.