Alright let me explain what Ports are.
Think of your router as a big fortress, with your computer being inside it. If someone wants to come into your fortress they come through a gate. A port is essentially the gate. However, if people want to leave your Fortress, they can leave through any gate, opened or closed.
Your router has all of these gates shut by default.
When a person wants to connect to your fortress, they are denied because the gate is not open.
By going into your router and opening these ports you are saying "Hey! Come on in"! and those packets get sent to your computer.
The reason why you see it on the Master Server is because your computer sends a message to the master server telling it that your game exists.
You don't have to change your password. I don't know why it says that...
Just add the ports, and make sure you have a Static IP or you will not receive the packets.