1. If you are gonna ask other people to take the time to help you, don't make them watch the video you watched. When asking for help always post exactly what you did so others can help you.
2. No one here is gonna be very keen to help someone who hasn't helped themselves at all. Following two guides without having a clue what any of the commands you're typing actually do != learning. The aircrack-ng website has plenty of material for you to read up on about what those commands you're typing actually do. I suggest you begin there.
3. If you had done any reading at all you would know the -3 attack requires an already authenticated client. This is, of course, your network you are practicing on and as such when doing an ARP replay attack try connecting another wireless device to your WLAN and give it another shot.