You can start by downloading the 2 week trial here
http://www.brillkids.com/teach-reading/free-trial.php and show your child the daily lessons. Have you visited the board for parents of children with special needs? You may find it helpful.
http://forum.brillkids.com/parents-with-special-needs-children/ Also, you can download the ebooks here by scrolling all the way to the bottom of the page.
http://www.brillbaby.com/ Best of luck!