How to remove a computer from my shared folder in Finder?

Just purchased a new iMac. After setting up Wi-Fi network connection, from DSL, now have a unknown computer listed within the shared folder in Finder. Have no idea who this is, but want to remove it. How?

Hi Vonni,
Often people will borrow, piggyback, a network without meaning to do harm. They just want a free internet connection. That being said, would you trust a stranger to plug their computer into your network? The best thing for you to do is read the manual that came with your router and find out how to turn on WPA encryption. Sometimes the router companies have support lines. After this is done, it means that anyone who uses your wireless connection will have to have your network name (AKA "SSID") and password. If you give them the password, they can use your network connection. If not, then they can't. That includes friends and family, when they are at your house for a visit. Giving them the WPA wireless password won't give them access to your computer (unless you use the same password - a bad idea), it will just give them access to your network.
There's no way that I know of to eliminate a computer from your Shared Folder area. That said, it also doesn't mean that they have access to your computer. It might actually mean that you have access to theirs!
To see what they have access to, go to the Apple menu at the top left corner of the screen and start System Preferences. Inside there, you will see "Sharing". If you uncheck all of the boxes in there, there is little that anyone could do.
David

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