Adding a pop up newsletter in WordPress is not difficult, but it does require a bit of configuration. To add a newsletter in WordPress, first create a new theme or plugin and add the following code to the function.php file:

add_action( ‘init’, ‘popup_newsletter_init’);

Then add the following line to your theme’s header.php file:

add_action( ‘wp_head’, ‘popup_newsletter_head’);

To create the newsletter content, first create a new post or page in your blog and add the following content:

2. To enable the pop up newsletter, go to your WordPress admin area and under Settings->Mail, add a new mail subscriber. Enter your email address and click on Add New.

Add a title for the newsletter and click on Save Changes. You will now be able to see your new newsletter in your WordPress admin area.