Add lives in quiz app

Thank you so much. The lives are already working.

May I ask something? What can I do if my I want (for example) that if the player reached 0 lives, it will go to another screen? I already tried adding it in the not already handled blocks but it just goes to a runtime error. And if they didn't reached 0 lives they will still go to another screen but for victory? Again. thank you so much