Hi There! All of your content is is accessed in the left column menu under "my content" you can see past social posts, blog posts, and premium content. You can also add new or create new ones from this screen or using the "asset creator" link in the menu.
In addition if you go to "stock photos" you will see a "my library" tab where you can see images that are in your library. You can also search through thousands of FREE stock photos and "save" them to your library to use in your social posts.
Hope that helps!