First off, your blog is whatever your username was on WordPress. So my blog is docdunn.wordpress.com. So your blog will be yourusername.wordpress.com.
To get to the dashboard, where we control everything in WordPress, you will need to go to https://yourusername.wordpress.com/wp-admin. Remember to replace yourusername with the user name you used to create your blog. Bookmark this site.
Here is a great video on WordPress. It is a short one. But if you want to revisit anything I’ve said or discussed, you will probably find it in this video.
Or here is a longer one.
And here’s a quick video on embedding media in WordPress.