How to manage files
To mange files (mainly images for most people), log in
and go to Content > Files
You will now be presented with a very classic view of a file browser with folders on the left and files on the right. To see files in a folder, simply select it on the left side. On the right side files can be selected and then downloaded, renamed, or removed. Use the Upload button to upload files - files are uploaded the the folder currently selected.
Always upload images to the images folder or a folder beneath it to make them available to the Page Editor.