Sorry for the late reply
I tried that button but newsletter block is still there.
I am able to remove block from front page by editing template files in block folder but when we click the contact us button then newsletter block turns back. But I want to remove it completely not just from front page
thank please give me suggestion
You need to remove it from EVERY block, not just the "Default Page Layout".
Under Design >> Layout, in the 2nd drop down, adjust each one such as: Homepage, Checkout Page, Login Page, etc....