Step 1
Add froobskindlebooks@gmail.com to your kindle's Approved Personal Document E-mail List
Step 2
Have your kindle's email address ready
Step 3
Login with your email and navigate to the Account page to enter your kindle email
Step 4
head to the Download page and download some books!
Press "Sync" in the drop down menu on your kindle to get the new books to show up (takes a min or two)