1) Open Calendar page on the left vertical menu

2) Click "Add Event" button

3) On new opened page , select "Blog" checkbox. Remove" Event" checkbox

4) Observe that following fields available to fill in. 

5) Fill in mandatory fields and save form.

6) In order to see created Blog, user have to go to Content -> Post / Event -> View Posts

7) Find existed item at table by latest ID (order ID by desc)