Importing HUD Widget into the GameMode's constructor

I tried many combinations and searched online for a while to come up with a solution that works. Nothing did; I either get a crash on compilation or UE4 fails to find the asset I’m referencing. Is this not the correct way to import a widget asset?

The widget contains buttons for a simple menu; new game, load game, etc. Upon clicking these buttons I’d like to receive an event or such in C++ so I can react to it. How can I do this?