Access your blog Layout > and click on the Add a Gadget > LinkList > in the section Secondary Menu.
Normal Link Options:
- Name Field Example: Features
- Url Field Example: /search/label/Features
DarkMode Button:
- Name Field: [darkMode]
Bookmarks Button:
- Name Field: [bookMarks]
- Url Field: Bookmarks Page
Popup SearchForm Button:
- Name Field: [search]
Side Navigation Button:
- Name Field: [sideNav]