Step 1. From the Admin Dashboard, go to Setup -> Settings, click on "Facebook/Twitter/Linkedin".
Step 2. And then select the Referral Program.
Step 3. In the following page,choose which social media network to modify and click "Update".
Step 4. Login into your Squarespace shopping cart.
Step 5. Under Website option, click on your site.
Step 6. Getting into the site option, click on "Design".
Step 7. Under Design, click on "Logo & Title".
Step 8. Add a Tag Line, upload your Logo and save it.