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I see you are on XP so best bet may be to make use of System Restore to get back to the position before you made the changes.
You will find it under "All Programs" >> "Accessories" >> "System Tools" >> "System Restore" simply choose a restore point the day before you made the change.
Port Forwarding is how the router knows which traffic to send to which PC on the lan full details of how this works and how to set it up should be included in the manual and will also be available on-line in most cases.
In essence you will be able to "talk" to your router and view current settings and make changes as necessary.
Hope this helps.
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