How do I allow a port?

How do I allow a port? I am trying to use a speaker share program called "SpeakerShare". What it does is to share a speaker. I have a speaker on my desktop. I would like to use the desktop speaker from my laptop. When I try to use SpeakerShare, it says that it can't connect to server. I asked the author of the program and got reply from him:
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bert [Entry]

"To be sure if this is linked to your router, or only to computers, you could try to connect directly the two computers, without a router in the middle.

This way, you would be sure if the router is the cause or not.

You can find a tutorial here, if needed."