Newsletter Popup gives you the ability to have an email subscription modal popup. Each time a new user visits your site, the user will see the modal popup for an email subscription.
Go to Theme Options > Newsletter Settings to change your NewsLetter:
Look at the above picture, you will see General settings of Popup Newsletter:
 Enable Popup Newsletter: By clicking On to enable Popup Newsletter, otherwise click Off.
 Page Popup Newsletter: Select a page for Popup Newsletter here.
 Popup Background: Click on “Add Image” to select background image for Popup Newsletter.
 Title: You can input the Title here.
 Description: You can input the description of Newsletter here.
 Input Placeholder: You can input the Placeholder here.
 Button: You can setup the content of button here.
 Delay Time: You can setup the delay time here.
 Enable Poppup on Mobile: By clicking On to enable popup on Mobile, otherwise click Off.