Как нажать на кнопку во втором окне qt designer python

Есть 2 окна созданных в qt designer. С помощью кнопки "регистрация" вызываю второе окно. На втором окне есть кнопка "добавить публикацию". С помощью нее я должен открыть docx файл, но на это код есть. Как мне с помощью кнопки вызвать функцию открытия docx файла.

zapusk.py

from PyQt5 import QtCore, QtGui, QtWidgets
import sys
from  autorize import  Ui_MainWindow
from registration import Ui_Form
import codecs
import easygui
import tkinter
import tkinter.messagebox
import re
import random
import docx
import os



class StartWindow(QtWidgets.QWidget, Ui_MainWindow):
    def __init__ (self, parent=None):
        super().__init__(parent)

        self.setupUi(self)   

        self.pushButton.clicked.connect( self.but_1 )

    def but_1(self):

        self.inst = QtWidgets.QWidget()
        ui_ins = Ui_Form()
        ui_ins.setupUi(self.inst)        
        self.inst.show()
        ui_ins.pushButton_3.clicked.connect(zagruzka)

        def zagruzka():
            doc= docx.Document(easygui.fileopenbox(filetypes=["*.docx"]))         
            text = []
            for paragraph in doc.paragraphs:
                text.append(paragraph.text)



if __name__ == '__main__':

    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

autorize.py

from PyQt5 import QtCore, QtGui, QtWidgets
from registration import Ui_Form

class Ui_MainWindow(object):

    def openWindow(self):

        #Открываем окно регистрации

        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_Form()
        self.ui.setupUi(self.window)
        self.window.show()




    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(287, 156)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.formLayout = QtWidgets.QFormLayout(self.centralwidget)
        self.formLayout.setObjectName("formLayout")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setEnabled(True)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.label.sizePolicy().hasHeightForWidth())
        self.label.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setItalic(False)
        font.setUnderline(True)
        font.setWeight(75)
        font.setStrikeOut(False)
        self.label.setFont(font)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.formLayout.setWidget(1, QtWidgets.QFormLayout.SpanningRole, self.label)
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setObjectName("label_3")
        self.formLayout.setWidget(2, QtWidgets.QFormLayout.LabelRole, self.label_3)
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.formLayout.setWidget(2, QtWidgets.QFormLayout.FieldRole, self.lineEdit_2)
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setObjectName("label_2")
        self.formLayout.setWidget(3, QtWidgets.QFormLayout.LabelRole, self.label_2)
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setObjectName("lineEdit")
        self.formLayout.setWidget(3, QtWidgets.QFormLayout.FieldRole, self.lineEdit)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.clicked.connect(self.openWindow)


        self.formLayout.setWidget(5, QtWidgets.QFormLayout.FieldRole, self.pushButton)
        self.pushButton_3 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_3.setObjectName("pushButton_3")
        self.formLayout.setWidget(5, QtWidgets.QFormLayout.LabelRole, self.pushButton_3)
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "АВТОРИЗАЦИЯ"))
        self.label_3.setText(_translate("MainWindow", "ЛОГИН"))
        self.label_2.setText(_translate("MainWindow", "ПАРОЛЬ"))
        self.pushButton.setText(_translate("MainWindow", "ЗАРЕГИСТРИРОВАТЬСЯ"))
        self.pushButton_3.setText(_translate("MainWindow", "ВОЙТИ"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

часть кода registration.py

self.pushButton_3 = QtWidgets.QPushButton(self.tab_2)
        self.pushButton_3.setGeometry(QtCore.QRect(10, 460, 1031, 23))
        self.pushButton_3.setObjectName("pushButton_3")

pushButton_3 кнопка добавления


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