Menu Madness: I just can't get it to work

I just can’t get the hang of this.
Tried and tried to get a hamburger menu to work, but couldn’t even after getting solid advice from a community member.
Gave that up as beyond my ability and now will be happy if I can get a simple dropdown menu to work on anything but desktop.

The menu looks acceptable in desktop, but when I scale down to table it overlaps the image in the navbar. In either smartphone configuration it just disappears.

It feels like it is not a hard solution but am for some reason unable to grasp it.

Thank you for taking the time to read this.
I apologize for my continued ignorance.

Here is my site Read-Only: [(Webflow - testa)]