Newsletter
From your Shopify admin, go to Online Store -> Themes.
Find the theme that you want to edit, and then click Customize.
Scroll down to Popup group at the bottom, Click Add section and choose "Toolbar mobile".
From the side menu, select Newsletter popup. Click + Add block and select "Newsletter" block, or click the Search bar to enter a search term.
Description
Add text to display as a custom content (Leave the field blank to hide the custom content)
Text (Color)
Set the text color for this block
Button label
Add text to display as a button on the section (Leave the field blank to hide the link)
Choose button style
Select the button style for the block:
Default
Transparent
Block padding
Top margin
Determines the height of the top outside space of the section. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).
Bottom margin
Determines the height of the bottom outside space of the section. Can be from 0px to 100px, increasing arithmetically of 1px (pixel).