Create posts in “Posts>Add new” section.
There are 7 post formats, that are displayed in tabs horizontally above the post title.
Select post format you like and add content to the content fields.
Assign category to your post, add tags and set featured image.
If you want to show featured image and author information in the post, go to Theme Options>Posts list options>Inner post page options and adjust the corresponding settings.
If needed, adjust settings of header and stunning header, that will be applied only for this particular post.
Save changes after the post is ready.