How to connect my blue ray to an existing rou

Hello,
I just purchased a Sansumg blue ray. The girl at the store told me that I did not need any cable connection only a USB adaptor. I bought it and inserted to the blue ray. It did not work. Reading the instructions of the blue ray book it said that I need a router. I have one in the family room (first floor) but the blue ray is in my bedroom (second floor). Please help me. Do I need another router? if I need a new router how to connect it in my bedroom if I already have internet in my house. Please help me.... Thank you, :-(