In order to modify your footer or your header menu, simply go to > Website > Menus:
If you wish to change your footer menu, go to > ... > Edit a menu :
You will have the list of all the tabs, where you have the possibility to edit them by clicking on > ... > Edit menu item:
You can change the title and link of the tab selected. Do not forget to do it for all activated languages on your website and confirm the change by clicking on > Add:
If you want to change the order of your tabs, grab it with your mouse and drag it to the desired place.
Do not forget to click on > Save for your website to be updated.