Posting blog and website pages need different operation.
To post website page, click "Pages" on the left side menu.
But to post blog page, click "Posts" on the left side menu.
Click "Add New".
Write title and contents. To write contents, you use the icon above the contents input area.(You can decorate texts, put links, etc.)
Click「Add Media」to place pictures.
For blog page, you can make categories.
Click "+Add New Category" and type the name of your category.
You can also make or change category from the "Categories" on the left side menu.
Add new category by fill in "Name".
Click "Add New Category".
Change the name of the title by the right side section.