Having problems with current project, desperately need help!

Could anyone lend me a hand possibly? I am incredibly Unreal novice so I followed a tutorial to get the bulk of what I wanted, leaving everything out that I didn’t need. Everything is working as I need it to but I can’t seem to get any menus working (pause or main). I am also trying to implement a “remove built object” function but no luck. I’ve tried everything I can think of, nothing is working. Below is the tutorial I followed along with a link to my zipped project on Google Drive.