need help with the unity default player prefab

after a lot of researching, I decided that making my own player movement script is best saved for another day but, I’m making a game where your goal is to press a button as fast as possible and since I want the player to be ready there is a countdown timer at the start. The problem is that I can’t disable the script because it does not detect it when I try to make a variable of the type PlayerMovement (The name that I gave the script and yes I did change the class name in the script to that too) thanks in advance for the help.

sorry i didnt understand you question will you please explain it properly or with image or with some code??