Media Library
Here you will learn how to upload images to the media library via your website administration panel.
Step-by-step guide
Login to your administration panel admin.yourwebsiteaddress.com
Click "Storefront CMS" > "CMS Features" > "Media Library" on the left hand navigation
Scroll to bottom of the page and then click on "Browse..."
Once you find the file you would like to upload click on "Upload"
You can store just about anything in the media library but it is primarily intended for files you plan on linking to from CMS Pages you create.