Go to Online Store > Themes, then click Customize on the Atlas Theme.
In the theme editor, click on the Header section.
Here, you can:
Upload your logo
Enable transparent or sticky headers
Add navigation menus
Control spacing and layout
How to change the header color:
In the theme editor, scroll to the bottom of the left-hand panel
Click Theme Settings
Select Colors
Find the setting for Primary Color
Change the primary color to update the header background
Click Save to apply your changes
To customize the Footer, scroll to the bottom of your page preview and click the Footer section.
Here, you can:
Add quick links, contact info, social icons
Show or hide newsletter signups
Change the copyright text
Click Save to apply your changes.