What make/model ereader do you have?
What exactly are you trying to change on it?
Okay, you need to change the Wi-Fi network.
Click here: http://www.oberondesign.com/pages/identify-your-kindle-model
Look at the pictures and tell me which model that you have
Samsung Galaxy tab 2 is not a Kindle model.
Please click on my link above and look at the pictures so you can provide me with the exact model