When I look at the DEMO of this theme, there is Newsletter textbox next to the available payment options but somehow, this does not show up in my application. So far I have not done any changes rather just configured the theme.
Any idea where do I need to make changes to fix it.
There is a setting in the Customer Settings to hide the Newsletter box, which is probably enabled in your store. Go to "Configuration -> Settings -> Customer Settings" in the nopCommerce administration and make sure that the Hide newsletter box setting checkbox is not checked.