Posts are what make your blog a blog — they’re servings of content that are listed in reverse chronological order on your blog’s front page (you can change the default order to list posts chronologically using these instructions).
Posts are always associated with a date, which is included in the URL. Sometimes, posts are confused with pages. See Post vs. Page for an explanation of the differences.
Publish a New Post
There are several ways to publish new posts. The easiest way is with the New Post button on the right side of the toolbar (it appears at the top of your screen when you’re logged in to WordPress.com).
Simply click New Post and you’ll be taken to the new post screen:
First, select which blog you’d like to publish this post on (if you have more than one) using the drop-down menu in the right toolbar:
If you’re writing a post and you’d like to format the text, click the kitchen sink icon to enable additional text formatting options:
The Dashboard Editor
You can also create and publish posts with the dashboard editor. Simply go to Posts → Add New from your dashboard:
It’s pretty much the same as the editor described above, but it also allows you to use the writing helper.
Publish Posts by Email
Write your post as an email and publish it on your blog via the Post by Email feature.
See the Post Screen support page for more details.
Go Back and Edit Posts
To edit or delete a post (whether it’s a draft or has already been published), go to Posts → All Posts in your dashboard:
Here you’ll see a list of all of your posts. Clicking Edit under the name of a post will take you to the dashboard editor, where you can make changes. To delete a post, click Trash.
See the Edit Posts Screen support page for more details.