I don't know where to go after making the function 'even_odd'

If you want to make a short one you can do

def even_odd(num):
    return False if num % 2 else True

If the number is not a multiple of 2 the value of num % 2 will be 0, which is "Falsy".

Otherwise, return True if the value of num % 2 is not 0 (Which is "Truthy").

What you could also do is

def even_odd(num):
    return not bool(num % 2)

This casts the value of num % 2 to a boolean, which will be False if the value is 0 and True if the value is other than 0 (Which means there is a remainder). You then take the opposite (the not) because the answer will be True if there is a remainder, and you want the answer to be True if the number is even (no remainder).

I can't see your code but you can solve it like this:

def even_odd(num_arg):
    if num_arg % 2 == 0:
        return True
    else:
        return False

I hope that helps a little bit