never do that you will be sad
This would be probably be because the app was purchased using that persons apple id there are 2 solutions to this you can either ask them to type in their password or delete the app and reinstall it using your apple id.
Easy. Go to the apple website and click create a apple id. It IS free, just asks you for a credit card number for verification and you can delete the credit card later on
how can you delete an itunes gift card if you enterd the code if apple Id does not work
You can't but you can get rid of all its data.
delete prmnent
No, no and no.
To make a new App Store password, you would need to change your Apple ID password. To do that, see the link below.
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how to delete paisalive account
In order to get a USA region Apple ID, you must register your Apple ID within the United States.
You have to contact the company and prove that you're actually you - then they'll reset your password and you can change it to something you'll remember better.