Why can't I click a button on my Billboard Gui I have inserted into a block?

I am trying to make this game, and the GUI in the part didn't work... so I converted to a Billboard Gui. now I added a Button in the Billboard Gui, but when I test the game out... I CAN'T CLICK THE BUTTON! Now, I tried activating some things, but it still doesn't work. PLEASE NOTE: WHEN MY MOUSE HOVERS OVER THE BUTTON AND I CLICK, IT DOES NOT WORK! please help me fix this or give me a script to fix this...