buttons on User list. update and delete button on Android Studio software

I wanted to put Delete button on a specifc user on the user list but i keep getting red lines. And i want to put update button to update the user on the user list. How do i do it?

here is the file: https://drive.google.com/drive/folders/1JYNScWAROzo3QXYFMKVW5zrg4oX7T2dG?usp=sharing

everything but idk if I did it right I keep getting red lines. I was expecting to have a delete button and update button on my userlist