Top User Menu is a menu, which is a part of the sign-in popup form from the social header and appeared after users' login.
The default links are Profile Settings, Account Settings, Widget Settings, Change Avatar, Change Cover Image, and Sign out. 
This menu comes with the demo data and can't be edited. This menu is tightened with the sign-in form. You can either enable or disable it under the customize panel > Header options > Elements visibility:
Although you can't edit this menu, you can create a new menu instead of this under Appearance > Menus. On the "Edit Menus" tab you need to click on the link "create a new menu", then add a menu name and, finally, create it.
Next, you will be able to add any necessary menu items from any section of the column on the left. You can add from 2 and more links there and choose the "Top User menu" display location.
If you want to have some links the same as from a default menu, you need to add them manually. These links locate in the TopUser Menu section:
If the section 'Top User menu' is unavailable for you, please, simply enable in under the screen options at the top:

Finally, you simply attach this menu to the "TopvCard menu" under Menu Settings on the bottom of the page by putting a tick to it. You can also attach any of the already existing menus to this place.
That's all! The newly created menu will be displayed instead of the default one.