Just a question: have you installed Kindle App on your tablet, right?
So, go on Amazon site, kindle section, manage your contents and device, devices tab, should be your tablet (or app), with an email @kindle.com (that you can manage as you like).
You can send your doc (it's a doc or docx file, right) via email to your kindle app with subject (mumble mumble... my brain isn't working good in those days) Convert.
It works for any kind of kindle (touch, pw, voyage), maybe can works for apps too.
You can try
