Or you could go to https://steemfiles.com and upload your e-book. First, login there with your posting, active, owner key or master password and click the up-vote buttons on the page. You can also up-vote in any condenser for the Steem blockchain: Click here to use your current condenser to see Steemfiles posts and vote them all up. A week later, you will get your allocation of space on steemfiles. Then you can upload files, including e-books! Continue, logging in twice a week to up-vote the posts to maintain your allocation of space.