[Python] how can i add entry boxes and other widgets to the window from outside of the...

I have a main window and made a pop-up window 'logwind' inside of the function 'log_window'. I want to add entry boxes to the window from outside the function but I keep getting a Name error. How can I code this so that I can make changes to the window from outside the function?

from tkinter import *
import tkinter.messagebox as box


tscreen = Tk()
tscreen.title("welcome to revise biology")
# sets window size
tscreen.geometry("1600x1024")

# insert my picture
# reads the image
image = Image.open("C:/Users/Amara/Downloads/pixel_art (1).png")
resize_img = image.resize((1300,700))
img = ImageTk.PhotoImage(resize_img)
# to show image
label1 = Label(image = img)
label1.image = img
label1.pack()

#adds text to the screen
label2 = Label(tscreen, text="welcome to revise
biology",bg="#e6d192")
label2.config(font=("Courier New",15))
label2.place(x=480,y=80)


def log_window():
global logwind
logwind = Toplevel(tscreen)
logwind.title("login/sign in")
logwind.geometry("600x400")
sbg = Image.open("C:/Users/Amara/Downloads/pixel_art (3).png")
sbg = sbg.resize((600, 400))
sl_bg_img = ImageTk.PhotoImage(sbg)
sl_label3 = Label(logwind, image = sl_bg_img)
sl_label3.image = sl_bg_img
sl_label3.pack()
label4 = Label(logwind, text="please login or sign up to continue", bg= "#e6d192")
label4.config(font=("Courier New", 10))
label4.place(x=160, y=50)
#return


button1 = Button(label1, text="continue",bg= '#fce5cd', command=log_window)
button1.place(x=580,y=250)
button1.config(font=("Courier New",15))

user_n = StringVar()
pass_w = StringVar()

def user_details():
user = user_n.get()
passw = pass_w.get()

user_n.set("")
pass_w.set("")

#makes text and entry box visible in logwind window
sign_up = Label(logwind, text="sign up")

s_user_lab = Label(logwind,text = "username: ", font=("Courier New", 10))
s_user_inp = Entry(logwind, textvariable= user_n, font=("Courier New", 10))

pass_lab = Label(logwind, text = "password: ",font=("Courier New", 10))
#makes text visible in logwind window and entry box made which displays each character
#as asteriks

pass_inp = Entry(logwind, textvariable= pass_w, show="*",font=("Courier New", 10))

ud_button = Button(logwind, text ="enter")


frame = Frame(log_window())
entry = Entry(frame)






tscreen.mainloop()


title screen of my program, pop-up window that I would like my entry boxes to be on The 2nd picture is what I got before I started coding the entry boxes.

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