Adding a personal menu really isn't intuitive, and I didn't find a complete description of how to do this in all of duckduckgo, google, hubzilla help pages. And though I think I saw something about this once in my timeline, I was unable to find it. Besides the help documentation, I did find this, regarding gerzilla

Anyway, I eventually understood the following:
1. The Webpages app has to installed and available.
2. You click on the App from the hamburger menu.
3. You choose Menus on left side.
4. You click on Create, then go through the steps. This part is fairly intuitive. And remember the name you gave the menu. You can see the links I chose for the menu on my channel page. In adding the links, I just pasted the full URLs - maybe it's possible to do otherwise.
5. You go to Settings | Channel Settings | Miscellaneous Settings
6. Under "Personal menu to display in your channel pages" you choose the name of the menu you created. (mine was site_nav)
7. The menu will now be included in the fullprofile widget, which by default appears on the profile page.
8. The fullprofile widget can also be added to other pages, if desired, by going to Settings | Display settings | Content settings | System Page Layout Editor (Advanced). (You don't see this if the "technical skill level" you chose under Settings | Account settings is too low)
9. Then you choose the layout you want to edit. The layouts have the same names as the pages (in my case, the pages that were relevant were channel, photos, bookmarks, network, as of now.

10. You add one of the following to the layout you want to edit. You add it inside a Region, such as aside (region=aside)
either: [widget=fullprofile][/widget] (this includes the menu + the vcard + additional elements by default.
or: [menu] your menu name [/menu] (from step 6)
11. Press submit, and check the result. If you've screwed up the layout, you can get the default layout back by clicking on reset or copying the text in the grey area above the edited part.

I think that's everything. It isn't so difficult when you know what to do.