scheme - Append to List Variable with Racket -

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I want to add an integer to a list that already exists using the racket. Here's the code I have. 

  (define countBlackPegs gameList playerList) (define blackPegs' ()) (if (equals? (Car player list) (car gamelist)) (set theory in me if statement Should be able to re-examine the separate part); (timeless) (0))    list each time) and then list the black pags that statement Combine it with the appropriate value on the basis. Unfortunately I have not worked with every endfound function correctly. Any help would be appreciated.   
 
 
 If you set  set! ) A list that already exists, to add a new element to the beginning, do something with these lines:  
  (set! Black pags (cons 1 blackPegs))   
 Or to add a new element at the end:  
  (Set! Black pags (Add black pags (list 1)))   
 However, warns that this style of programming is not recommended in the plan, you want to try to avoid changing changes A - is like a functional programming style.

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