I need help with coding my Arduino UNO for my school project.

I am using tinkercad for coding and making my arduino. Please help me code thisㅠㅠㅠ I researched and got help from my teacher and i still don't know how to code my work. I am making a electric piano that makes sound when someone presses the button. This also has a RGB LED attached on the side so that the lights appear when the button is pressed. I posted my project so take a look and Dm me freely. I am desperate the submition is until friday and i need to make a physical one aswell.