Weird issue / Internet / MSFS 2020

Could anyone help me please ?
I’m trying to open some ports on my router but I’m not sure how to do

https://answers.microsoft.com/en-us/windows/forum/apps_windows_10-win_xbox/xbox-app-say-nat-type-open-but-server-conectivity/b53270b2-ceb7-4063-a5af-d77b82e23e2a?auth=1
When I add a port, I have many options, like HTTP, FTP, HTTPS, etc
Which one do I need ?
And the last phrase I didn’t understand

" Pick a port number between 49152 and 65535. If you don’t want to pick one, just use 60209 "
Where do I need to add this ??