This Guide will Help you to edit Header and Footer Page.
When you are on SiteBuilder dashboard. You will see Pages option on Sidebar Navigation Menu. Hover on Pages and Click on All Pages
Once you see all Pages. Click on the Edit Icon of the Header Page or Footer Page whichever you want to Edit shown like in the image below.
Once you open Header Page in editor you will be able to Edit all the stuff from Header Page as shown image below.
Note: You can also add extra items that you want to display in Header. Just Drag and Drop them as shown in image below.
You can also edit Footer Page as similar to Header Page shown above. Click edit icon of Footer Page as shown in above images and edit.
To change the footer copyright text just click on that and change as per your needs as shown in image below.