• Go to Site and then click on Media Manager.
  

• Click on the Stories folder icon (this folder is where you will mostly upload your images).
  

• Click on the Browse button.
  

At the File Upload window:

• Navigate to the folder on your computer that contains the image you want and upload it.
  

• The file now shows in the box. Click Start Upload.
  

• Once the file has uploaded you should see your image in the list of files.