How can you use custom social media icons?
If you want to use custom markup / images for the social media icons in the footer of the email, here's how you can do that. You can drop the custom markup under Settings > Template > Custom Social Icons HTML:
Here's the markup that you'll want to start with and customize:
Notice how you have access to some template variables from within the markup.
Once you save, you'll be able to refresh the email preview to see what it looks like: