When logged into a CLF site with the Site Manager role, you can update and edit menus at /admin/structure/menu.
There are 5 default menu options.
Menu links can be edited by opening the menu you wish to edit, and selecting the “edit” option to the right of the menu link.
Enter the text for the link. This is the text that will display in the menu
*/parent/page* or an external URL such as *<https://example.com>*. Enter <nolink> or # to display link text only. If linking to an internal page, do not use the absolute path that includes your root domain such as https://clf-prod.parallelpublicwork.com/page but rather the relative path /pageLinks can be reordered or nested by dragging the 4 arrow icon and pressing save.

Only 3 level nesting is allowed in the main menu. However, it is recommended to avoid 3 levels if possible to present a simpler navigation structure to your users.