Go to Appearance > Menus. Select “Main Menu Left” from the dropdown to edit the main top menu. Also make sure you make edits to the mobile menu and footer menu to add any new links you need there as well. The mobile menu also needs links to the calendar and contact pages, as those are hidden by default on mobile since they are under the search box on desktop. From here you can select pages on the left to add to the menu, and you can drag and drop them as well. Make sure you don’t drag them in such a way that they slide under as a child item, as we don’t support dropdown menus in this theme since they don’t work so well on mobile. You can also add custom links if the page is external to your site.