Member freakee has responded to your thread in the Introduce Yourself section of the forum, where you first asked for help, so read his post.
Ask any additional questions you might have in the current (Networking) section of the forum (Not in the Introduce Yourself area).
Basically, both computers, including your router, need to be connected to the same subnet (Apple Menu>System Preferences>Network).
The easiest way to do this is to select DHCP rather than manual setup (Personally, I prefer to allocate all IP addresses manually for security reasons).
Also, sharing must be enabled (Apple Menu>System Preferences>Sharing>File Sharing ... etc).
You will also be asked for password authentication.....but you should know this already.
The page at might help you further.
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