Link
- 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 Toolbar mobile. Click + Add block and select "Link" block, or click the Search bar to enter a search term. 
Setting
Description
SVG icon
Enter the SVG icon
Text
Add text to display as a custom content (Leave the field blank to hide the custom content)
URL
Set the link, for example the customer service page
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