Navigation Buttons
Desktop
Navigate to CONTENT > LINK LISTS > "DESKTOP - NAVIGATION BUTTONS"
From there you can adjust the order the links appear, where they point, and what text displays.
Mobile
The top links/buttons are managed under CONTENT > LINK LISTS > "MOBILE - NAVIGATION BUTTONS".
The bottom two buttons are managed under CONTENT > LINK LISTS > "MOBILE - LOWER NAVIGATION BUTTONS".
Resources: