The Media Manager is where you upload images, create maps and add videos from YouTube or Vimeo to use in your blog articles. Each article has its own library so your files are always organized for you.
When you click on "Manage Media Items" from within a blog article you will be taken to the media manager page. If you've not uploaded any media files yet it will look like screen shot 1. You will see in the screen shot that there are 3 types of media you can choose to add to your blog articles.
Select the type of content you want to add then follow the instructions.
Screen Shot 1