Hi there! It sounds like you might be referring to the social share icons in the footer of your mailing. These are what your recipients can use to quickly share your email from their inbox to their social profiles. They look like this:
If you want to add your own social icons to a mailing, you can use our handy Follow Block in the drag & drop content options:
When you drag that content block into your mailing, you'll be prompted to customize the links with this popup:
You can also have your own social icons hardcoded into any gallery template if you like! We’ll customize any single readymade template with your brand’s colors, logo, text styles and social media links for just $149. Let me know if you're interested!