Add Player to a "blocked list"

I’ve got it set up so that a list of players shows up on the left, and you can click them to see if you want to block them, and add them to a block list. So 3 things, remove player from game,add them to a list so they can’t rejoin, and have the list editable in the lobby too (I will figure out how to gain access to said list later).

My problem is that I can’t figure out how to block a person from the button, I can only seem to block “Owning Player”, but that’s the owner of the widget, not the player from the button.

I also don’t know how to add a player’s name to a list that can be accessed anywhere? (I’d like to be able to access it in other parts of the game)