First I want to say thank you for helping, because you are not obligated to and also it's quite a hassel.
I read link you gave me:
"
How to configure McAfee Personal Firewall to allow inbound connections on specific ports"
Then that's how far I can get to (see image below). I don't know how to fill into the forms. I can half-ly understand what you say (and the article in the link), due to my limited knowledge of computer.

Before "edit" I only able to upload a small image, so I typed out the form (coz they don't allow me to copy and paste >"<). Then later I found a way to upload a bigger image. But I already typed so I will leave it here anyways (I don't want to delete my effort)
Quote:
Open a port on your PC so a service can be accessed by other PCs on your network and the Internet.
Add System Service Port
System Service Name: [fill in the blank]
System Service Category: [fill in the blank]
Service Description: [a blank box]
Enter single port numbers separated by commas, or port ranges with dashes, for example 137-139, 445, 400-5000.
Local TCP/IP Ports: [fill in the blank]
Local UDP Ports: [fill in the blank]
Open ports to: (2 choices)
[ PCs in Work and Home networks only]
[All PCs]
Forward port activity to other PCs using Internet Connection Sharing.
[only a “Yes” box] (have the option to click the box or not to click the box)
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