When you are ready to begin creating a post, you will simply add a new post. At the Dashboard screen, select Add New Post from the Posts link.

The next screen is where you will actually create the post.

Just like writing in a Word document, you can add the title for your post where it says Enter title here and then the contents of your post is written in the body below. There are options to add media if you want to add images or videos to the post.

If you look on the right side you'll notice where you can Save Draft or Publish the post.

Wordpress automatically saves a Post as you're working. It's still a good idea to click on Save Draft to be sure you save the newest content before exiting the screen. Any time you are creating a post it will not be visible to anyone until you actually Publish it.