The image manager is a place where you can store images and icons related to your game design projects. First you'll start out by creating a folder:
Then you can upload images to the folder:
Your plan comes with 20 gigs of storage, which should be more than enough for years and years of use. However, it should be noted that you don't even need to use the image manager. You can also use images from other file storage systems such as Dropbox, Google Drive, and Imgur.