How can i change my app review name on my ipad?

In iTunes, go to your Account information (clicking on your Apple ID tab). Under settings is your nickname. You can change it there.

You need to do this on your computer.

Launch iTunes and go to Store>View My Apple ID. Enter your password. Go down to Settings and on the right hand side you will see Edit Nickname. Click on that to change your nickname.

I am using a Mac, but it works the same way in Windows. You have to do this in iTunes.