The footer is a global module which must be edited from the settings folder in Sitecore:
/sitecore/content/Ti/Site Settings/Footer
To edit the different sections of the footer:
Change to your local market flag
Expand the footer item in sitewide settings
Expand the footer item you wish to edit e.g. Social
4. In the link field click "insert link" to choose an item from within the Sitecore content tree to link to or select "insert external link" to add in a website URL
5. In the text field enter the description for the link as you want it to appear on the front end. A maximum of 40 characters should be entered into the text field
6. In the icon field, expand the folders in the left field to search for the icon you need. Social media icons will all be located in the "social icons" folder
7. Double-click your chosen icon so that it appears in the right-hand box (to remove the logo double-click it again to move it back to the left)
8. Save and publish