I'm really close to this working, but can't seem to get the return portion correct

I'll show you the correct code first, and then explain why it works:

import random

pass_num = 10 # don't need the parenthesis 
def random_num(number):
  new_number = random.randint(1, number)
  return new_number

random_num(pass_num) # this actually puts your pass_num variable into the function you defined

Now I will explain a few things. Your function was defined correctly, but it is a good habit to name the input value something other than a variable that already exists. I used number (instead of your variable pass_num). This is to avoid thinking that pass_num is the only value that is meant to be placed inside your function. You could place anything in the function that you would like.

Next, remember that in this case, your function needs to return a value. Key word - your function. Make sure you have the return command written inside of your function. You also need to tell it what to return, which is the new variable you created new_number.

Last part. Just defining a function doesn't do anything unless you use it. To use the function, you must call it (the last line I wrote) and you want to send pass_num into the function.

NOTE: 'pass_num' will automatically take the place of 'number' inside the function. 'number' is kind of like a placeholder that waits to have a real value input, and once it does, it will change update all 'number' variables inside the function automatically.