I need my dialog box to close when the ok button is clicked. How do I do that ?
Assuming you created the button you should be able to just set the button click event as follows:
button.clicked.connect(self.close) where button is the button name.
Although since you did not provide any code with your question it's hard to know if this is what you're asking for...
Closing an .ui file on a click of a button (pyqt5)