GUI text Main Menu

Hello everyone,

I'm making a horror game and I started the menu today. I made 4 gui text and put music when you start the game. the only problem is that I tried making a script so the text will change color if the mouse is over it but it doesn't work. I searched on the internet for tutorials but nothing works. How can I make the GUI text change color when the mouse is over it of change the selection with the arrow keys? thanks a lot

Btw in my scene i have GUI text, GUI text, GUI text, GUI text, Main Camera