1. Home Pages' Footer
Please go to Admin > Agruco Options > Templates > Edit Home page / Home 2 / Home 3 > Layout
In the layout section, you're supposed to scroll down to edit the Footer elements.
2. Inner pages' footer
Inner pages are assigned to other prebuilt templates: Inventory, Full-width, No Sidebar, and Shop
First, you should check which template the page is assigned to. (By editing a page, check "Templaza options" to find out which template style your page is assigned to.)
Ex: Service page is assigned to Full-width template, so you're supposed to edit the layout of this template, then changes will reflect properly in front-end.
In this case, you should edit the footer content of a template (ex: Home page template), then click "Save Section"
After that, the Footer section will be saved as a sample in the template library
When editing a footer of other templates, you can click add new section > Select the save Footer section in library. This step will save a lot of time