pyqt how to control Qmainclass from other thread?

im trying to send "append" to qmainwindow from a qthread. the code seems like working but i get this error msg everytime i use append in qthread.

QObject::connect: Cannot queue arguments of type 'QTextCursor' (Make sure 'QTextCursor' is registered using qRegisterMetaType().)

tried to search on google and i figured you need signal and slot but its hard for me to understand as im not a native english speaker and theres not enough information about it in my native language. i would really appreciate if someone could fix my code with explanation! thankyou

import time as time
import sys
from PyQt5 import uic
from PyQt5.QtTest import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *




form_class = uic.loadUiType("test.ui")[0]

class Worker(QThread):
    def __init__(self, parent):
        super().__init__(parent)
        self.parent = parent
        self.running = False
    def run(self):
        while self.running:
       
            self.parent.testbrowser.append("test msg")
            time.sleep(1)
                
       
    def pause(self):
        self.running = False


class WindowClass(QMainWindow, form_class) :
    def __init__(self) :
        super().__init__()
        self.setupUi(self)

        self.btntest.clicked.connect(self.btntestfunction)
        self.btntest_2.clicked.connect(self.btntest2function)

        self.worker = Worker(self)
    def sleep(self,n):
        self.testbrowser.append("waiting")
        QTest.qWait(n*1000)

    
    def btntestfunction(self):
        self.testbrowser.append("start")
        self.worker.running = True
        self.worker.start()

    
    def btntest2function(self):
        self.testbrowser.append("pause")
        self.worker.running = False
        self.worker.pause()
    
if __name__ == "__main__" :

    app = QApplication(sys.argv) 
    myWindow = WindowClass() 
    myWindow.show()
    app.exec_()