Hello,

If you are using Popu element: http://prntscr.com/pfvlyr

Insert the Popup element and configure https://gyazo.com/860840ad2f673484cf26656bedd8c8d7 then insert the text block and insert the shortcode https://gyazo.com/cf364bf6448d61dac5c8444ef08bc47f

You can insert any content into the popup element. This element would appear only on the clicking of the button, which is shown on the page where you add the element.

If you are configuring the global Promo popup you can find the options in the Theme Settings > Shop > Promo popup.

Here is the code to align the fields in the global Promo popup

body .mc4wp-form input[type=email]{
	width:80%;
	max-width:80%;
}
body .mc4wp-form input[type=text]{
	width:85%;
	max-width:85%;
}

Best Regards