Updated review

I was complaining about the sound but now I figure out how to fix it.

I am posting my solution for other users who might encounter the same problem.

If you click on the icon on the left top (inside the "abc song" app) that says "for parents only" you can see that tab table had put the following solution in:
On the iPad it’s possible that your side switch is set to lock screen rotation.
In this case you can control sound volume by:

* Double tapping the home button
* Swipe on the bottom menu from left to right
* Tap the speaker icon to the far left
* It should show "Mute Off" below the play button
You can also set the side switch functionality by going to "Settings > General > Use side switch to" and set it to control mute.

Now the app works but I am still giving only a 3 star because tab table tech support never responds to me when I emailed them to fix the no sound and I found the solution by accident.

Tangerine Wong about The ABC Song Educational Game