Need help with rotation code

I am trying to rotate a billboard so it face straight forward instead of backward. I am doing the Unity Karting Mod tutorial on the Unity Learn page(Idk if this helps but I’m using the ‘Basic Billboard’)

. I was not aware that I needed code for this so I found code and am trying to drag it onto my billboard like it says to do but this error message pops up. can someone help me? All of the images are down below

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that’s much easier, thank you! I knew something was off when coding was used for something as simple as rotating