First thing that you need to do is to go to ‘Post’ section in your Wordpress admin.
Then click on ‘Add New’
This will take you to another page where you can start adding content to your blog post:
You can add different content blocks by clicking on the blue plus in the left top corner:
You can also edit the style of the component. To do this look at the right side of the page. You will see some different parameters such as font size, font color etc.