Here's a basic template:

using System;
using System.Collections.Generic;

public static class Kata {
  public static IEnumerable<string> FriendOrFoe (string[] names) {
    Console.WriteLine( string.Join(", ", names) );
    return names;  
  }
}

Console.WriteLine(names);

Should do the trick. But make sure to return something that the function expects (you could just "return names" to avoid errors).

You should use it inside the method, and you don't need brackets around "names".

See if this article helps. You can also visit Codewars Discord and ask any questions you have in #beginners, or in #help-solve channels.

Console.WriteLine is fully operational on Codewars, and it should work if used correctly.