Spread Email Marketing Guides:

Add Facebook, Twitter or LinkedIn Share Button In Your Email

Step1:

Click at where you 'd like to insert the button;

Step2:

In the drop box from "Spread Link", choose the share button you need. facebook button

Step3:

The final effect is shown as below:
facebook button effect

Click to learn How to to add ‘Click Here' and ‘Unsubscribe' link in email .