Hi Faranep, you can't enter your Little Reader license key in your iPad because the license key will only work with the PC software.
What you can use in your iPad is the
Little Reader Touch app.
If you want to play all of your curriculum lessons in the app instead of using your computer, you need to enable iAccess, which is sold separately. You can buy iAccess at the
BrillKids Online Shop.
For instructions on how to enable iAccess, see:
http://support.brillkids.com/entries/21268593-how-to-enable-iaccess-for-little-reader-touch