Adding a wired computer to wireless network

[Dylanj123]

Hey guys.
This is what I would like to do.
I have computers running on a wireless network (Desktop plugged into the router and my laptop on wifi) but my sister has come home for the weekend and wants the internet on her copmuter. Although it is not a centrino and doesn't have built-in wifi so I was wondering if I could plug her computer into the router wired.
But I cant figure how to do this?
Please I was hoping for this to be up and running tonight.
Cheers
Bartman

 

[Arm_Pit]

You should be able to use another ethernet cord and plug it directly from the router into her comptuer assuming both are ethernet and you still have 1 slot left.