1 pointYou must disable WiFi in the camera and connect a USB cable between the PC and the camera.
1 pointIf you can't see anything despite being sure you have a bright star in the field of view it is probably because you are way, way out of focus and the light from the star is so wide spread that it does not register on the live view frame, which is only a few millisecond so anything faint need to be fairly close to focus to start with. One way to see if you have something in the FOV what I do at times is take a 5 to 10 seconds still image an see how close to focus I'm really at. The loop features helps with this approach too. Keep us posted,